For decades, researchers have questioned whether boys and girls are born with the same natural ability in math. In 2005, cognitive psychologist Elizabeth Spelke took a firm stand, stating that there are no differences in overall intrinsic aptitude for science and mathematics among women and men.



Now, the evidence is even stronger. In a new study, researchers from <a href="https://www.harvard.edu/" target="_blank" rel="noreferrer noopener">Harvard University</a> and several institutions across France examined math performance in more than 2.5 million French schoolchildren. 



The team found that at the very beginning of first grade, boys and girls start off nearly equal in math. But just four months into formal math instruction, a small gap appears - and it keeps growing.



<h2 class="wp-block-heading" id="h-nationwide-study-tracks-the-math-gap">Nationwide study tracks the math gap</h2>



The research draws on a French government testing program that was launched in 2018. This nationwide effort tracked <a href="https://www.earth.com/news/reminiscing-can-boost-language-development-in-preschoolers/">language</a> and math skills of young students from first through sixth grade. 



Over five years and across four student cohorts, the program gave researchers an unmatched view of early math development.



At school entry, French girls scored slightly better than boys in language. Math scores, though, were essentially the same. 



"The headline conclusion is that the gender gap emerges when systematic instruction in mathematics begins," Spelke explained.



<h2 class="wp-block-heading" id="h-looking-for-gender-differences">Looking for gender differences </h2>



Spelke had already spent decades studying how young children understand numbers and shapes. Back in 2005, she wrote a major review for American Psychologist. The piece challenged the notion that boys are biologically wired for better math performance than girls.



"My argument was, 'OK, if there really were biological differences, maybe we would see them in the infancy period,'" said Spelke. 



She and her team always tracked <a href="https://www.earth.com/news/young-children-learn-gender-stereotypes-from-storybooks/">gender</a> in their studies, but they never found infant boys outperforming girls in math, or vice versa. Still, Spelke admitted that something could be happening later in development.



"The fact that there are no differences in <a href="https://www.earth.com/news/conscious-awareness-when-does-our-sense-of-purpose-emerge/">infants</a> could be because the abilities that show gender effects actually emerge during preschool," she proposed.



<h2 class="wp-block-heading" id="h-math-instruction-for-boys-and-girls">Math instruction for boys and girls</h2>



In recent years, Spelke has turned her attention to how <a href="https://www.earth.com/news/scientists-discover-a-better-way-for-kids-to-learn-math/">children learn counting</a> and numbers in real classrooms. 



Spelke partnered with Nobel Prize-winning MIT economist Esther Duflo to advise the Delhi office of the Abdul Latif Jameel Poverty Action Lab (J-PAL). The team is helping four Indian states create and test math lessons for children in preschool through first grade.



In France, she works alongside her longtime collaborator, neuroscientist Stanislas Dehaene. Together, they serve on the French Ministry of Education's Scientific Council, which helped develop the EvalAide testing program. 



The idea was simple: measure where every child stands in math and language and use that data to guide better teaching.



<h2 class="wp-block-heading" id="h-gender-gap-emerges-in-math">Gender gap emerges in math</h2>



For this study, the team analyzed data from four full cohorts of first-graders entering school between 2018 and 2021. 



What they found was consistent: no math gap at the time of school entry, a small but significant gap favoring boys after four months, and a steadily widening gap by second, fourth, and even sixth grade.



"It was even bigger in fourth grade," Spelke said. "And in sixth grade it was bigger still."



Interestingly, the gender gap in language shrank slightly after the first few months of school and stayed relatively stable in later years.



<h2 class="wp-block-heading" id="h-ruling-out-old-explanations">Ruling out old explanations</h2>



So why does the math gap grow with time in school? The researchers ruled out several familiar theories.



"If there was really a pervasive social bias, and the parents were susceptible to it, we would expect boys to be more oriented toward spatial and numerical tasks when they first got to school," said Spelke.



But that didn’t happen. At school entry, there was no math gap. This points away from both biological and early social bias explanations.



<h2 class="wp-block-heading" id="h-an-experiment-during-the-pandemic">An experiment during the pandemic </h2>



The EvalAide dataset offered other insights. French first-graders can be nearly a year apart in age, depending on when their birthday falls. 



The team wondered if the older students were skewing results. They weren’t. The widening gender gap aligned more closely with time spent in school than with age.



Then came an unusual variable: COVID-19. The 2019 cohort missed the final 2.5 months of first grade due to lockdowns. That gap year created a natural experiment.



"With less time in school, the amount of the gender gap grew by less than it did in the other years where there wasn't a long school closure," said Spelke.



<h2 class="wp-block-heading" id="h-confirming-the-math-gender-gap">Confirming the math gender gap</h2>



The cohort also began school just after a national education crisis. In early 2019, French students had scored <a href="https://www.polytechnique-insights.com/en/braincamps/society/how-to-improve-the-relationship-between-education-and-employment/maths-an-essential-subject-whose-level-is-falling-in-a-majority-of-countries/#:~:text=In%202003%2C%2015%25%20of%20French,European%20average%20of%20527%20points.">lowest</a> among 23 European countries in math, according to international rankings. 



In response, the French Education Ministry - guided by its Scientific Council - called for more math teaching in <a href="https://www.earth.com/news/covid-19-pandemic-setbacks-reduced-kindergarten-readiness/">kindergarten</a>.



Sure enough, a tiny math gender gap appeared in fall 2019 among new first-graders. That gap hadn’t shown up in 2018 but was still present in 2020 and 2021.



<h2 class="wp-block-heading" id="h-problems-in-early-math-instruction">Problems in early math instruction </h2>



The study doesn't pinpoint a single cause, but its message is clear: differences in math achievement between boys and girls seem to grow as a result of what happens in early <a href="https://www.earth.com/news/schools-are-in-a-battle-with-cell-phones-to-keep-students-engaged/">school</a> instruction.



"We still don't know what that is exactly," Spelke said. "But now we have a chance to find out by randomized evaluations of changes to the curriculum."



The findings put pressure on education systems to ask hard questions about how math is taught in the early years - and what needs to change to make it fair for everyone.



The full study was published in the journal <a href="https://www.nature.com/articles/s41586-025-09126-4">Nature</a>.



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Early math instruction may unintentionally favor boys

For decades, researchers have questioned whether boys and girls are born with the same natural ability in math. In 2005, cognitive psychologist Elizabeth Spelke took a firm stand, stating that there are no differences in overall intrinsic aptitude for science and mathematics among women and men. Now, the evidence is even stronger. In a new study, researchers from Harvard University and several institutions across France examined math performance in more than 2.5 million French schoolchildren. The team found that at the very beginning of first grade, boys...

In a new study published in the journal <a href="http://dx.doi.org/10.1371/journal.pone.0278443">PLoS ONE</a>, researchers have found that small turtles are often sold illegally as pets online. The U.S. Food and Drug Administration prohibited the sale of small pet turtles in 1975 due to the number of illnesses they can cause, including Salmonella <a href="https://www.earth.com/news/covid-19-reinfection-increases-the-risk-of-fatal-complications/">infection</a>.&nbsp;



"In the 1960s and 1970s, hatchling turtles became increasingly popular pets in the United States. By the early 1970s, about 4% of households in the U.S. owned at least one turtle, and about 15 million hatchling turtles, primarily red-eared sliders (Trachemys scripta elegans), were being sold annually," wrote the study authors.



"As hatchlings, red-eared sliders are about the size of a U.S. quarter (24.3 mm), and their size, coupled with a lime green shell and red stripes on the sides of their heads, made them popular and highly desired as pets. During the same period, the Centers for Disease Control and Prevention was documenting salmonellosis, an intestinal disease caused by Salmonella bacteria, cases in the public, and it was estimated that approximately 280,000 cases per year were attributable to turtle ownership."



The researchers explained that small children, in particular, were contracting salmonellosis because of poor hygiene after handling turtles. They noted that salmonellosis can cause severe illness and death, especially in young children, the elderly, and those with compromised immune systems.



The experts set out to determine whether websites are selling small turtles, in violation of the 1975 regulation. They found that half of online sellers fail to provide information about the disease risk and the laws pertaining to small turtles.&nbsp;



"Despite passage of the Food and Drug Administration regulation nearly 50 years ago prohibiting the sale of these turtles, our research has demonstrated that internet sales of small turtles currently represent part of the thriving online pet trade in the U.S. Enforcement of the regulation is likely done in an ad hoc manner in brick-and-mortar pet stores, but there are jurisdictional challenges to enforcement of this federal regulation by state agents in most states," wrote the study authors.&nbsp;



"In addition, law enforcement agents at the state and federal levels may feel that they have more important issues regarding internet-based wildlife sales, including monitoring sales of endangered species or potentially injurious species, such as big cats or primates. However, salmonellosis outbreaks continue to occur in the U.S. and are regularly attributed to pet turtles, which represent a more expansive public health concern than that posed by potentially injurious animals."



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Small turtles are often sold online despite disease risks

In a new study published in the journal PLoS ONE,...

<a href="https://www.earth.com/news/belgian-microbiologists-improve-the-flavor-of-beer/">Beer</a> is one of the oldest and most popular alcoholic beverages in the world. While some people love and other hate the distinct, bitter taste of hops used to flavor beer, new research led by the <a href="https://en.unimib.it/">University of Milano-Bicocca</a> has revealed that particularly “hoppy” brews could have unexpected health benefits. The experts discovered that, in laboratory dishes, chemicals extracted from hop flowers can inhibit the clumping of amyloid beta proteins, which are associated with Alzheimer’s disease (AD) – a debilitating neurodegenerative disease, characterized by memory loss and personality changes in older adults.



Part of the difficulty in treating AD is that there is a considerable time lag between the beginning of underlying biochemical processes and the onset of symptoms, often with several years separating them. Thus, since irreversible damage to the nervous system can occur before one even realizes that they might have the disease, preventive strategies and therapeutics which can intervene before symptoms appear are of increasing scientific interest.



One of these strategies involves so-called “nutraceuticals,” or foods which have certain medicinal properties, such as – as the present study argues – the hop flowers used to flavor beers. The scientists created and analyzed extracts of four common varieties of hops using methods similar to those used in the brewing process. Their analyses revealed that these extracts had antioxidant properties and could prevent amyloid beta proteins from clumping in human nerve cells. The most successful extract was from the Tettnang hop, which is found in many types of lagers and lighter ales.



When the researchers separated this extract into fractions, the one containing high levels of polyphenols exhibited the most powerful antibiotic and aggregation-inhibiting activity and promoted processes allowing the body to eliminate misfolded, neurotoxic proteins. By testing the extract in a C. elegans animal model, the scientists found that it protected the worms from AD-related paralysis, although this effect was not extremely pronounced. These findings nevertheless suggest that hop compounds could serve as the basis for the development of nutraceuticals which halt the development of Alzheimer’s disease.



“Our results show that hop is a source of bioactive molecules with synergistic and multitarget activity against the early events underlying AD development. We can therefore think of its use for the preparation of nutraceuticals useful for the prevention of this pathology,” the authors concluded.



The study is published in the journal <a href="https://doi.org/10.1021/acschemneuro.2c00444">ACS Chemical Neuroscience</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Beer could help protect against Alzheimer’s disease

Beer is one of the oldest and most popular alcoholic...

The Thwaites Ice Shelf in the Amundsen Sea is one of the biggest <a href="https://www.earth.com/video/melt-ponds-on-the-greenland-ice-sheet/">ice sheets</a> in West Antarctica but it is highly unstable and disintegrating rapidly. It buttresses and braces against the mighty Thwaites glacier and slows down its rate of melting, at least on its eastern edge. This is important because the Thwaites glacier, also nicknamed the “Doomsday glacier,” has been retreating rapidly over the past 20 years and has become the largest net contributor to sea-level rise among the Antarctic glaciers.&nbsp;



For this reason, an international team of scientists, led by researchers from the <a href="https://www.uea.ac.uk/">University of East Anglia</a> in the UK, investigated the factors influencing the melt rate of the Thwaites Ice Shelf. Using two automated sensor systems, moored about 4 km from one another, the researchers collected data from different depths under the Thwaites Ice Shelf. The sensors recorded water temperature, salinity, pressure and horizontal current speed at an upper depth of a few hundred meters, and at a lower depth of over 700 meters.&nbsp;



In their research study, published in <a href="http://dx.doi.org/10.1038/s41467-022-35499-5">Nature Communications</a>, the researchers found that the shallow layers of the ocean underneath the Thwaites Ice Shelf warmed considerably during the period between January 2020 and March 2021. It did not appear that the excess heat originated locally because there was little evidence of melting at the base of the ice sheet where the sensors were installed. In addition, the content of glacial-meltwater under the ice increased in the upper layers at the same time.&nbsp;



Combining the measurements with computer simulations, the researchers determined that most of this meltwater likely originated from the Pine Island Ice Shelf, further to the east, and flowed into the area beneath the Thwaites Ice Shelf under the influence of a gyre (circulating ocean current) centered in Pine Island Bay. &nbsp;This proposed mechanism explaining how warm meltwaters are found under the Thwaites Ice Shelf was also supported by data collected using tags that were attached to seals.&nbsp;



Both the model simulations and the data from seal tags showed that a gyre near the Thwaites Ice Shelf weakens in winter, which allows more heat to reach shallow areas beneath the ice shelf. Satellite images showed that the Southern Hemisphere summer season of 2020/2021 was unusual because it had a high concentration of sea ice in regions near the Thwaites Ice Shelf, and this is known to weaken the gyre in Pine Island Bay, meaning that excess meltwater from adjacent ice sheets is not removed by the gyre but instead enters the cavity under the Thwaites Ice Shelf.



When the base of the Pine Island Ice Shelf comes into contact with slightly warmer ocean water, it melts and the fresh water mixes with the saltwater. This makes the ocean water less saline and, therefore, less dense. It forms a buoyant layer of water that is warmer than the surrounding water, and when this flows under the Thwaites Ice Shelf, it melts the base of the ice there. This means that the melting of one ice shelf can influence the melting of another ice shelf nearby. This is a factor that has not been considered before.



“We have identified another process that could impact the stability of ice shelves, revealing the importance of local ocean circulation and sea-ice," said study lead author Dr. Tiago Dotto of the Centre for Ocean and Atmospheric Sciences at UEA.



“Circumpolar Deep Water, a warm variety of Antarctic waters, is a key player in melting the base of ice shelves,” he said. “However, in this study, we show that a great amount of heat at shallow layers beneath one ice shelf can be provided by waters originating from other melting ice shelves nearby. Therefore, what happens to one ice shelf, can impact the adjacent ice shelf, and so on.”



“This process is important for regions of high ice shelf melting such as the Amundsen Sea because one ice shelf sits next to the other, and the export of heat from one ice shelf can reach the next one through the ocean circulation."



“These atmosphere-sea-ice-ocean interactions are important because they can prolong warm periods beneath ice shelves by allowing warm and meltwater-enriched water to enter adjacent ice-shelf cavities," said Dr. Dotto.



“Gyres potentially existing in other regions around Antarctica may also cause a greater number of ice shelves to be prone to intense basal melting associated with prolonged warm conditions, and as a result further contribute to global sea-level rise.”



The authors conclude that ice shelves are connected through the coastal circulation and that what happens under one ice shelf greatly influences what happens under the ice shelves further downstream in the coastal current. They emphasize that future models should consider the meltwater pathways from adjacent ice shelves if they are to simulating the fate of the Antarctic ice shelves accurately.&nbsp;



Image Credit: Karen Alley



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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Why the "Doomsday glacier" is melting from below

The Thwaites Ice Shelf in the Amundsen Sea is one...

An international team of scientists has recently uncovered an extremely rare piece of evidence that <a href="https://www.earth.com/news/early-dinosaurs-benefited-from-changes-in-global-climate/">dinosaurs</a> sometimes ate mammals. The experts discovered the foot of a tiny mammal approximately the size of a mouse preserved inside the gut contents of a&nbsp;Microraptor zhaoianus -a small feathered dinosaur that lived in the early Cretaceous period.



According to study co-author Corwin Sullivan, a paleontologist at the <a href="https://www.ualberta.ca/index.html">University of Alberta</a>, it is extremely rare to find conclusive evidence of dinosaurs’ diets because of how difficult it is for a dinosaur’s gut contents to be preserved.&nbsp;



“There was always interest in [Microraptor’s] diet because there had been previous specimens that contained remains of different vertebrates inside the rib cage, but we have the first one that contains parts of a mammal,” he explained.



The fossils of this Microraptor were found within Jurassic and Cretaceous lake deposits in today’s northeast China. Previous fossils belonging to this species discovered in the same region have been found with gut contents of fish, birds, and lizards, suggesting that they had highly diverse diets. However, it is not yet clear whether Microraptor consumed these animals in a predator-prey relationship or by scavenging.&nbsp;



Information about dinosaurs’ diets is crucial for learning more about the inter-species relationships existing at the time these creatures roamed the Earth. “We’re slowly gathering pieces of information about these past ecosystems and the animals that inhabited them. So what this discovery does is fill in a little bit of information in that it’s showing the diet of&nbsp;Microraptor&nbsp;was even broader, even more generalist, than we thought previously,” Sullivan said.&nbsp;



“That tells us something about this animal and, by extension, tells us that there were generalist carnivores in these ancient ecosystems — that that niche existed,” he concluded.



The study is published in the <a href="https://doi.org/10.1080/02724634.2022.2144337">Journal of Vertebrate Paleontology</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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Rare evidence shows that dinosaurs ate mammals

An international team of scientists has recently uncovered an extremely...

A team of scientists from <a href="https://www.hopkinsmedicine.org/">Johns Hopkins Medicine</a> investigating how the brain works amid age-related <a href="https://www.earth.com/news/hearing-loss-linked-to-dementia-in-aging-dogs/">hearing loss</a> has recently discovered that old mice are less capable than young ones to turn off certain actively firing brain cells in the midst of ambient noise. This inability creates a “fuzzy” sound stage which makes it difficult for the brain to focus on one type of sound, such as spoken words, while filtering out surrounding noise.&nbsp;



Although scientists have long associated inevitable age-related hearing loss to deteriorating hair cells in the inner ear, this new study suggests that the brain has much to do with this condition, and thus, that it may be possible to treat this type of hearing loss by re-training the brain to tamp down wildly firing neurons.



The researchers recorded the activity of 8,078 neurons from the auditory cortex of 12 old mice (16 to 24 months old) and 10 young mice (two to six months old). In a first experiment, they conditioned the mice to lick a water spout when hearing a specific tone. Then, they made the mice perform the same exercise while playing “white noise” in the background.



While, without the ambient noise, both young and old mice licked the water spout when hearing the tone, in the presence of the ambient noise the old mice were worse at detecting the tone and licking the spout than their younger counterparts. Moreover, the young mice tended to lick the spout at either the onset or end of the tone, while older mice licked it at the start of the auditory cue, but sometimes also before the tone was presented, suggesting that they thought a tone was present when it was not.



Next, in order to assess how auditory neurons performed during these hearing tests, the scientists employed a method called “two-photon imaging” – which uses fluorescence to identify and measure the activity of hundreds of neurons at the same time - to get a glimpse into mice’s auditory cortex.



The analysis revealed that, under normal conditions (when the brain worked correctly in the presence of ambient noise), some neural activity increased when the mice heard the tone, while other neurons were repressed. However, in the older mice, there was more neural activity overall, and the neurons that were supposed to turn off when the tone was played in the presence of ambient noise failed to do so. Moreover, just before the auditory cue, there was up to twice as much neural activity in old mice, indicating that their brains may be “firing” or behaving as if a tone is present when it is not.



“In older animals, ambient noise seems to make neuron activity more ‘fuzzy,’ disrupting the ability to distinguish individual sounds,” said study senior author Patrick Kanold, a professor of Biomedical Engineering at Johns Hopkins.



Fortunately, due to its flexible learning potential, the mammalian brain could be “taught” to address this auditory fuzziness in older animals, including humans. “There may be ways to train the brain to focus on individual sound amid a cacophony of noise,” Kanold concluded.



The study is published in the <a href="http://dx.doi.org/10.1523/JNEUROSCI.0955-22.2022">Journal of Neuroscience</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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What is the brain’s role in age-related hearing loss?

A team of scientists from Johns Hopkins Medicine investigating how...

As climate change drives hotter temperatures worldwide, spring is arriving earlier than ever in parts of North America. According to a recent study led by the <a href="https://www2.uottawa.ca/en">University of Ottawa</a>, the shift to an early spring may have serious consequences for bumblebees and the crops that depend on them for <a href="https://www.earth.com/news/rare-pollination-discovered-between-red-seaweed-and-crustaceans/">pollination</a>.&nbsp;



The experts report that bumblebees are not shifting their activity to earlier in the year, which threatens their ability to find food sources or causes the bees to miss out on food altogether. The study is one of the first to examine the effect of seasonal weather changes in relation to bumblebees.



“This study represents crucial groundwork for understanding that climate can impact the seasonal timing of biological events,” said lead author and PhD student Olga Koppel.



“Bumblebee survival is strongly in our best interest, as we rely heavily on bee-pollinated agricultural crops, including vegetables, fruits, and even clothing fibres such as cotton. The over 40 bumblebee species that are native to North America provide this invaluable economic service.”



For bumblebees who emerge from winter hibernation before the arrival of spring flowers, survival is not likely. As a result,&nbsp; smaller colonies will appear the following year.&nbsp;



In collaboration with Professor Jeremy Kerr, Koppel examined the relationship between climate and the spring emergence of bumblebees. The researchers analyzed a database of specimens from museum collections across North America, which included 17,000 individuals of 21 species.&nbsp;



The results of the analysis confirmed that climate strongly explained variation in spring emergence timing in 15 of the 21 bumblebee species.



“This research has demonstrated that bumblebee emergence timing can be biased heavily in the direction of climate changes, which has implications for similar research on other species, as well as for the urgent conservation of these valuable pollinator species,” said Koppel. “This study provides a roadmap for evaluating large-scale temporal responses to climate change for many insects and other animals.”



The research is published in the journal <a href="https://www.journals.elsevier.com/biological-conservation">Biological Conservation</a>.



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Bumblebees are waking up too early from hibernation

As climate change drives hotter temperatures worldwide, spring is arriving...

When <a href="https://www.earth.com/news/zebrafish-gene-editing-human-disease/">zebrafish</a> swim toward their intended targets, strong currents frequently push them off course. However, the tiny fish swim back to their original location, determined to finish their journey. In order to clarify how do animals know where they are in their environments and how this knowledge determines their choices, a team of researchers led by the <a href="https://www.hhmi.org/">Howard Hughes Medical Institute</a> (HHMI) has investigated the brains of zebrafish when they are involved in such behaviors. The analysis revealed that the hindbrain – an evolutionary conserved or “ancient” region in the back of the brain – helps them compute their location and use to information to decide where they need to go next.



The scientists placed several zebrafish in a virtual reality environment which simulates water currents. When the current shifts unexpectedly, the fish are initially pushed off course, but they are able to correct for those movements and go back to their initial position. By using a whole-brain imaging technique, the researchers managed to search the animals’ entire brains to see which neural circuits are activated during their course-correcting behavior.&nbsp;



Although they expected to observe a significant amount of forebrain activation – where the hippocampus, a brain structure containing a “cognitive map” of the environment, is located – the experts were surprised to notice activation in several regions of the medulla, where information about the fish’s location was being transmitted via a hindbrain structure called “the inferior olive” to the motor areas of the cerebellum which enable the animals to move. When this pathway was blocked, the fish were unable to navigate back to their initial location.



These findings suggest that regions of the brain stem “remember” a fish’s original location and generate an “error signal” based on its current and past locations. “We found that the fish is trying to calculate the difference between its current location and its preferred location and uses this difference to generate an error signal. The brain sends that error signal to its motor control centers so the fish can correct after being moved by flow unintentionally, even many seconds later,” explained study lead author En Yang, a postdoctoral fellow at HHMI.



However, it is still unclear whether the same neural networks are involved in similar behaviors in other animals. Moreover, further research is also needed to clarify whether this hindbrain network could be the basis of other navigational skills, such as when fish swim to a specific place for shelter.



The study is published in the journal <a href="http://dx.doi.org/10.1016/j.cell.2022.11.022">Cell</a>.&nbsp;



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



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How can lost fish get back on track?

When zebrafish swim toward their intended targets, strong currents frequently...

Groundwater that is produced by melting permafrost transports <a href="https://www.earth.com/news/large-amounts-of-methane-are-released-from-fjords/">methane</a> to Arctic lakes, where it is released into the atmosphere. This process has been quantified for the first time in a study led by Carolina Olid of the Geomodels Research Institute of the <a href="https://www.ub.edu/web/portal/en/">University of Barcelona</a>.



According to Olid, climate change will enhance the process of methane runoff from permafrost to Arctic lakes through groundwater, which is why it is important to include this process in climate prediction models.



The research was focused on Arctic lakes located in the sporadic permafrost region of northern Sweden, where the layer of soil above the permafrost thaws annually and then refreezes.



"In this region, the average annual temperature has risen considerably in recent years and is now above 0ºC. This causes permafrost - with its abundant organic matter rich in carbon and greenhouse gases - to thaw. Through the circulation of groundwater, the thawing permafrost acts as a spring that supplies the hydrologically connected lakes in the region with greenhouse gases. The gases are finally emitted into the atmosphere and contribute to amplifying global warming," said Olid.



The researchers found that the flow of methane gas into lakes is more intense in the summer, when the most water is circulating. Hotter temperatures also promote the production of methane in the subsoil.



"Climate change and accelerated permafrost melting will increase the amount of greenhouse gases that can be transported to the lakes through groundwater. The increase in precipitation - up to 40% in the Arctic over the next decade - will also increase the flow of groundwater and, therefore, the discharge of methane into the lakes," said Olid.



"Permafrost water contains high concentrations not only of greenhouse gases such as carbon dioxide (CO2) or methane (CH4), but also of other compounds such as nutrients, and pollutants (mercury, etc.). The arrival of these compounds in the lakes generates harmful impacts on the natural environment and the organisms that live in lake ecosystems, as well as in terrestrial systems (bogs, etc.)," said study co-author Gerard Rocher-Ros.



"These are effects with implications for the entire aquatic trophic chain of both the lake itself and the network of interconnected rivers and streams, which have an impact on the ecosystem services provided by natural resources to society," said Olid.



The study is published in the journal <a href="https://www.nature.com/articles/s41467-022-31219-1">Nature Communications</a>.



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Arctic lakes are releasing methane from melting permafrost

Groundwater that is produced by melting permafrost transports methane to...

For a long time, humans have wondered how to better move across wet or frozen surfaces safely, whether to improve shoes for walking on dangerous sidewalks, or tires to maneuver on roadways. Now, a team of researchers led by the <a href="https://www.uakron.edu/">University of Akron</a> has investigated what makes it possible for some arctic animals, such as <a href="https://www.earth.com/news/polar-bears-are-forced-to-hunt-for-food-on-land/">polar bears</a>, to run across the ice so effortlessly and gracefully without slipping or falling.



“We had an ongoing project for many years focused on ice; we were looking at the friction of materials and we were interested in this topic because we are in Akron and our national partners need to develop tires with a strong grip on the road in ice and snow conditions,” said study senior author Ali Dhinojwala, a professor of Polymer Science at Akron. “Nate [lead author Nathaniel Orndorf, a former doctoral student at the same university and currently a senior material scientist at <a href="https://www.bridgestoneamericas.com/en/index">Bridgestone Americas</a>] had an interest in how nature has adapted to this solution for snow. The example that came to his mind was polar bears – and the research began from there.”



Previous studies investigated the microstructures (the papillae, or tiny bumps on the pad of the foot) of polar bear paws, arguing that they were evolutionary adaptations for improved traction on snow. However, these studies did not include other bear species, such as some closely related to the polar bear that the current study examined, including the brown bear, or the American black bear.



The scientists collected samples and replicas of bear paw pads from museums and taxidermists across the U.S. and examined them using a scanning electron microscope. Moreover, they also created 3D printouts of the structures in order to vary their diameter and height of features and tested them in snow to assess how they reacted to inclement conditions.



The analysis revealed that while all bears (except the sun bears, a more distant species relative to the other ones the experts investigated) had papillae on their paw pads, the papillae on polar bear paws were 1.5 taller compared to those of other species, a feature which helps them increase traction on snow. Although polar bears have smaller paw pads than other species – most likely because of greater fur coverage for heat conservation – their taller papillae compensated for this, providing a 30 to 50 percent increase in frictional shear stress.



“Papillae are not unique to polar bears. Previous work [in that area] made the implicit assumption that papillae themselves are adaptations for enhanced traction on snow without studying the paw pads of other bears. It was fascinating for us to discover that the other North American bears have them as well and that the physical characteristics of the papillae are what matters for traction on snow,” said study co-author Austin Garner, an assistant professor of biology at <a href="https://www.syracuse.edu/">Syracuse University</a>.



These findings could be applied to develop better automobile tires, as well as equipment for high altitude climbers or companies that specialize in delivering goods in bad weather.



The study is published in the <a href="https://doi.org/10.1098/rsif.2022.0466">Journal of the Royal Society Interface</a>.&nbsp;



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

How do polar bears get traction on ice?

For a long time, humans have wondered how to better...

According to UK <a href="https://www.metoffice.gov.uk/">Met Office</a>’s annual global <a href="https://www.earth.com/news/greater-temperature-changes-linked-to-worse-extinction-events/">temperature</a> forecast, 2023 is likely to be one of the hottest on record, with average temperatures rising to 1.2C above pre-industrial levels. If these predictions turn out to be correct, this will be the tenth year in a row with global temperatures above 1C.&nbsp;



Until now, the hottest year on record - since scientists began keeping track of global temperatures in 1850 - was 2016, a year in which the ‘El Niño’ climate pattern in the Pacific played a major role in increasing temperatures all over the globe.



“Without a preceding El Niño to boost global temperature, 2023 may not be a record-breaking year, but with the background increase in global greenhouse gas emissions continuing apace it is likely that next year will be another notable year in the series,” said Adam Scaife, the head of long-range predictions at the Met Office.



“The global temperature over the last three years has been influenced by the effect of a prolonged La Nina – where cooler than average sea-surface temperatures occur in the tropical Pacific. La Nina has a temporary cooling effect on global average temperature,” added Nick Dunstone, the Met Office scientist who led the 2023 forecast.



&nbsp;“For next year our climate model is indicating an end to the three consecutive years with La Nina state, with a return to relative warmer conditions in parts of the tropical Pacific. This shift is likely to lead to global temperature in 2023 being warmer than 2022.”



However, scientists warn that the fact that global average temperatures are at or above 1C for a decade masks the significant temperature variation across the globe, with locations such as the Arctic having warmed by several degrees above pre-industrial times.



Thus, it is crucial to take swift action to keep global temperatures below 1.5C in order to avoid the worst impacts of climate change, by substantially reducing greenhouse gas emissions and rapidly transitioning to sustainable energy sources.



More details and statistics can be found on Met Office’s <a href="https://www.metoffice.gov.uk/about-us/press-office/news/weather-and-climate/2022/2023-global-temperature-forecast">website</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Global temperature in 2023 expected to be among highest on record

According to UK Met Office’s annual global temperature forecast, 2023...

A team of scientists led by the <a href="https://www.ku.dk/english/">University of Copenhagen</a> and the <a href="https://www.nottingham.ac.uk/">University of Nottingham</a> has found that the Earth’s atmosphere contained far less cardon dioxide than previously thought when <a href="https://www.earth.com/news/diverse-forests-are-more-resilient-and-productive/">forests</a> first emerged on our planet about 385 million years ago. These findings have major implications for understanding how land plants affect the climate.



Before the Earth’s continents were colonized by tall trees and forests, shallow shrub-like plants with vascular tissue, stems, shallow roots, and no flowers had already invaded the land. Scientists have long thought that the atmosphere at that time had far higher CO2 levels than today - with an intense greenhouse effect leading to a warmer climate - and that only with the emergence of forests which assumedly promoted the removal of CO2 from the atmosphere, the Earth tipped into a colder state, with ice covers forming at the poles.



However, by using a cutting-edge method to calculate CO2 levels based on observations made from fossil plant material, the researchers discovered that, between 410 and 380 million years ago, the atmospheric CO2 levels were only 30 to 70 percent higher than today. Moreover, a paleoclimate model showed that the Earth was a temperate planet with average tropical surface air temperatures ranging from 24.1 to 24.6 degrees Celsius.



“We used a fully coupled atmosphere-ocean model to find that Earth had ice-covered poles when forests emerged. Yet, land plants could thrive in the tropical, subtropical and temperate zones,” said study co-author Georg Feulner, an expert in Climate Modelling at the <a href="https://www.pik-potsdam.de/en/home">Potsdam Institute for Climate Impact Research</a> in Germany.&nbsp;&nbsp;



These findings suggest that trees may actually play an insignificant role on atmospheric CO2 levels over longer time scales, since early trees had deeper root systems and produced more developed soils that were linked to lower nutrient loss. Due to this more efficient nutrient recycling system, trees have a smaller weathering demand than the shallow shrub-like vegetation that came before them. This idea contradicts previous theories arguing that trees with deeper root systems promoted CO2 removal through enhanced chemical weathering and dissolution of silicate rocks.



The researchers concluded that primitive shrub-like vascular plants may have caused a massive decline in atmospheric CO2 levels earlier in history, when they first spread across the continents, while simultaneously leading to a rise in atmospheric oxygen levels.



The study is published in the journal <a href="http://dx.doi.org/10.1038/s41467-022-35085-9">Nature Communications</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

How did ancient plants affect atmospheric CO2 levels?

A team of scientists led by the University of Copenhagen...

Many vertebrate <a href="https://www.earth.com/news/animals-are-a-powerful-driver-of-forest-recovery/">animals</a> communicate effectively using sounds that convey their state of emotional arousal and valence (whether they are experiencing positive or negative emotions). If you have ever heard a pig scream, you will know that this sound is extremely efficient at expressing emotional distress. Is it possible that humans can understand the emotional content of sounds made by different species? Darwin himself described similarities between how humans and other animals express emotions, which leads to the possibility that there is a universal system of expressing emotional content within mammalian groups.&nbsp;



In a new study by researchers led by the <a href="https://www.ku.dk/english/">University of Copenhagen</a>, participants listened to sounds made by several different ungulate species and answered questions about what they perceived the emotional state of the animal to be. Although previous research has shown that humans can detect the level of emotional arousal (bodily activation), there is very little research on whether humans can interpret the valence of another mammal’s calls.&nbsp;



For the investigation, more than a thousand people from 48 different countries listened to the vocalizations made by individuals from six mammal species. The sounds of goats, cattle, Asian wild horses (Przewalski's horses), domesticated horses, pigs and wild boars were played to participants online. This marks the first time that so many different animal sounds have been tested on humans, both in terms of arousal (i.e., stress/excitement).&nbsp;



The participants successfully identified the arousal states of the ungulate calls in 49 to 54 percent of cases. They were also able to identify the correct valence of the call, but there was a much larger variation in this variable between species (33–68 percent correct). These results were greater than would have been expected if the participants had simply made random guesses about the arousal state and valence associated with the animal’s call, indicating that humans are able, at least to some extent, to understand the emotional expressions of other mammals.



The researchers recorded the calls of test animals in various states of arousal, as assessed by the animal’s heart rate and body movement behavior. Each animal’s valence was also noted at the time that the call was made. For example, animals making calls while expecting to receive food were in a positive emotional state, whereas those experiencing food frustration made calls while in a negative emotional state. The emotional valence was also verified using behavioral indicators described in the research literature.&nbsp;



“Our results show that, based on its sounds, we humans can determine whether or not an animal is stressed (or excited), and whether it is expressing positive or negative emotions. This applies across a number of different mammals. We can also see that our ability to interpret the sounds depends on several factors, such as age, close knowledge of animals and, not least, how empathetic we are towards other people,” said study co-author Elodie Briefer.



Participants also gave details of their age, gender, occupation and level of education. They were asked whether they worked with animals of any sort and, just before completing the online process, were required to take an empathy test to assess the extent to which they understand and share the emotions of other humans.&nbsp;



The results, published in the journal Royal Society Open Science, showed that people who do well on human empathy tests are also measurably better at decoding the emotional sounds of animals. In addition, the ability to understand the emotional content of animal vocalizations is most developed in people who are between 20 and 29 years old, and in people who regularly work with animals. Thus, the results suggest that an intimate knowledge of animals generally promotes the understanding of animals’ emotional lives.



“It was really surprising for me and very interesting that those who performed well in a recognized test to assess people's empathic level – towards other people, mind you – were also significantly better at understanding the emotional lives of animals,” said Briefer.&nbsp;



“We could have used other tests that measure how a person relates to animals, but to make it simpler, we stuck to this particular empathy test, which was translated and validated for the eight languages in the study. It is a recognized test, but it measures empathy towards other people. Nevertheless, we see a clear correlation with the ability to interpret animal sounds."



“This is good news for animal welfare. For example, farmers who want to ensure that their pigs are thriving are well-equipped to capture that. Today, animal welfare is defined by the emotional life of animals. Therefore, new knowledge provided by this study is important for both basic and applied research. On the one hand, it increases the understanding of animal emotions, and it opens opportunities to improve that understanding."



According to Briefer, the knowledge contributed by the study shows the path to concrete ways to work on improving animal welfare through an understanding of their emotional lives.



“For example, the development of an app where AI supports those who work with animals offers promising perspectives. But it is also important to note that there is nothing to prevent someone from beginning to improve their own skills now if they interact with animals on a daily basis,” Briefer points out.



“When students try the test in class, they obtain an average of 50 percent of correct answers on the first try. After we talk about the sounds and knowledge that we have about animal vocalizations, they improve. On their second attempts, they typically get above 70 percent correct. It is natural to explore this potential in future studies. I definitely think that it’s possible to practice and improve this ability for the vast majority of people,” said Briefer.



The researchers conclude that their results support the idea of a common emotional system between mammals, which may have been preserved throughout evolutionary history. They found that participants were able to recognize high and low arousal states in particular, but could also discern whether animals were experiencing positive or negative emotions at the time they made the vocalization.&nbsp;



According to Briefer, this may be because we in the mammalian family share common traits when it comes to how we express the intensity of our emotions (i.e., arousal), and these have been conserved throughout evolution. In contrast, the expression of emotional valence is more difficult to interpret and may not have been as highly conserved across species.



“Roughly speaking, higher-frequency sounds (in addition to other features) are often a sign of higher arousal, and lower-frequency sounds a sign of lower. If a subject uses the same standard to interpret animal sounds that he or she would use to understand a human, then it is often correct. We express arousal more similarly than valence because it is linked to stress pathways, which are evolutionarily well preserved in mammals."



The researchers say that domestication may have played a role in the ability of humans to recognize and empathize with the emotions of animals. Their results show that humans are better able to recognize the emotional expressions of domesticated species than of wild species. However, they do acknowledge that more research is needed to test whether humans can perceive subtle differences in animal calls conveying information about emotional arousal and valence.



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Empathetic humans are better at understanding animal sounds

Many vertebrate animals communicate effectively using sounds that convey their...

Green,Ecoduct,Over,An,Empty,Highway,During,Sunset.

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A new long-term study in Monkton, Vermont, reveals that wildlife tunnels significantly reduce amphibian road mortality during seasonal migrations. 



Frogs and salamanders often cross roads to reach breeding ponds each spring, but many are killed by vehicles. 



Researchers from the <a href="https://www.uvm.edu/" target="_blank" rel="noreferrer noopener">University of Vermont</a>, in collaboration with local citizens and the Vermont Agency of Natural Resources, installed two underpass tunnels in 2015. 



Over a 12-year monitoring period, they observed an 80.2% reduction in amphibian deaths, and up to 94% for non-climbing species like salamanders. 



The study used a before-after-control-impact design and documented more than 5,200 amphibians, highlighting the tunnels’ effectiveness even in nearby buffer zones.



Funded at $342,397 - far cheaper than wildlife crossings for large mammals - the project showcased the power of community-led conservation.



Local groups initiated the effort after observing mass amphibian deaths. Wildlife cameras later captured over 2,200 amphibians using a tunnel in just one spring, along with other species like raccoons and bobcats, indicating wider ecosystem benefits.



This marks the first peer-reviewed, long-term data set in the northeastern U.S. confirming amphibian-specific underpasses work. 



The study urges transportation departments to incorporate these designs into road planning and highlights how community action, thoughtful infrastructure, and persistence can make a real difference for biodiversity.



The full study was published in the <a href="https://linkinghub.elsevier.com/retrieve/pii/S1617138125000780" target="_blank" rel="noreferrer noopener">Journal for Nature Conservation</a>.



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Wildlife tunnels save millions of amphibians

https://youtu.be/XYgiPzmNBTU?si=eFYY7gPHU1JznLvU A new long-term study in Monkton, Vermont, reveals that...

Scientists are transforming chocolate into a functional food by infusing it with probiotics and prebiotics, aiming to create a treat that satisfies cravings while supporting gut health. 



The challenge lies in maintaining chocolate's beloved texture and flavor while adding health benefits.



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https://youtu.be/Ug657J67iEo?si=w96YjGMsg939LD_3
</div></figure>



Probiotics - beneficial microbes that balance gut bacteria and aid digestion - are typically fragile and can be destroyed by stomach acid or processing. 



Prebiotics act as food for these microbes, helping them thrive. Together, they form "synbiotics," a powerful health combination.



Researchers Smriti Gaur and Shubhi Singh from India's Jaypee Institute of Information Technology took an innovative approach, using natural prebiotics like corn and honey instead of complex processing methods. 



They created five chocolate varieties: a control and four synbiotic versions containing different combinations of prebiotics, probiotics (Lactobacillus strains), and flavor enhancers (cinnamon or orange).



Laboratory simulations of human digestion showed the probiotics remained viable for over five hours, suggesting they could survive long enough to benefit gut health.



Taste tests were positive, with researchers particularly enjoying the orange-flavored variety, describing it as having "vibrant citrus notes" complementing the "rich cocoa" with a "luxurious" texture.



This research represents just the beginning. With further refinement of strains, textures, and flavors, chocolate could evolve beyond mere indulgence to become a functional food that nourishes while it delights.



The study is published in the journal <a href="https://pubs.acs.org/doi/10.1021/acsfoodscitech.4c00741" target="_blank" rel="noreferrer noopener">ACS Food Science &amp; Technology</a>.

Is chocolate the next nutritional powerhouse?

Scientists are transforming chocolate into a functional food by infusing...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Nushagak Bay in southwest Alaska

[sendtonews key="0ynNMYkMKa-2340414-12187" type="single"] Today’s Video of the Day from the...

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Flu viruses are more flexible than expected

[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> explores the ability of salt to transform the way that foods and beverages taste. Salt is known to cover up undesirable flavors, such as bitterness in coffee or beer, but how exactly does sodium chloride change the taste of other compounds?



One previous study showed that, not only does salt suppress bitterness, but also enhances sweetness and sourness. Another study revealed that bitterness reduction by salt seems to be happening at the tongue receptor level as well as in the brain.&nbsp;



While it is known that salt taste is mediated by the presence of sodium channels in the form of taste buds, experts believe that there is also an unknown receptor responsible for how we taste salt that has not yet been identified.&nbsp;



Video Credit: ACS Reactions



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

How does salt makes things taste better?

[sendtonews key="X0f6OHYoI4-2310561-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Santiago, the capital city of Chile. The city is located in the center of the Santiago Metropolitan Region, which has a population of about eight million people.&nbsp;



'The weather of Santiago resembles the Mediterranean climate with dry and warm summers with temperatures reaching up to 35°C (from October to March) and cool and humid winters that can drop to 0°C (from April to September)."



"The city lies in the centre of the country’s central valley around 80 km from the Pacific Ocean to the west and borders Argentina to the east. A tiny part of Argentina is visible in the top-right corner of the image where the mountain crest of the Andes Mountains acts as a divider between the two countries," says ESA.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Santiago, Chile in South America

[sendtonews key="JRaP49ISmm-2357509-12187" type="single"] Today’s Video of the Day from the...

Spiral,Galaxy,,Illustration,Of,Milky,Way

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Astronomers at <a href="https://www.jhu.edu/">Johns Hopkins University</a> have created an interactive map of the universe, including the actual position and real colors of 200,000 galaxies. The map allows the public to access data that was previously only available to scientists.



The map was developed using data collected by the Sloan Digital Sky Survey. For over two decades, a telescope in New Mexico was aimed at slightly different locations to capture the night sky.&nbsp;



"Growing up I was very inspired by astronomy pictures, stars, nebulae and galaxies, and now it's our time to create a new type of picture to inspire people," said map creator Brice Ménard, a professor at Johns Hopkins. "Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries. But nobody took the time to create a map that is beautiful, scientifically accurate, and accessible to people who are not scientists. Our goal here is to show everybody what the universe really looks like."



"In this map, we are just a speck at the very bottom, just one pixel. And when I say we, I mean our galaxy, the Milky Way which has billions of stars and planets. We are used to seeing astronomical pictures showing one galaxy here, one galaxy there or perhaps a group of galaxies. But what this map shows is a very, very different scale."



"From this speck at the bottom, we are able to map out galaxies across the entire universe, and that says something about the power of science."



The <a href="https://mapoftheuniverse.net/">interactive map</a> is available online, where it can be downloaded for free.



Video Credit: Johns Hopkins&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Interactive map of the universe includes 200,000 galaxies

[sendtonews key="e4ZG0Jawp3-2374785-12187" type="single"] Astronomers at Johns Hopkins University have created...

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Lesotho: Africa's "Kingdom in the Sky" Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features northwest Lesotho in South Africa.



According to ESA, Lesotho is the only nation in the world that lies completely above 1,000 m in elevation. The country is famous for its tall mountains and narrow valleys, and is known as Africa's "Kingdom in the Sky."



Out of a population of around two million people, about 80 percent live in rural areas. More than 75 percent of these people are engaged in <a href="https://www.earth.com/news/climate-change-will-have-a-global-impact-on-agriculture/">agriculture</a>, including rainfed cereal production and animal grazing.&nbsp;



ESA reports that the country’s agricultural system faces a growing number of issues, with climate-related vulnerabilities such as drought, floods and extreme temperatures occurring more frequently. 



Diamonds are amongst the minerals found in the mountains. Indeed, Lesotho can truly be called the Kingdom in the Sky. Beautiful, culturally rich, safe, affordable, and easily accessible from Durban and Johannesburg, mountainous Lesotho is a vastly underrated travel destination. the Kingdom of Lesotho (Sotho: 'Muso oa Lesotho) is an enclaved country in southern Africa. It is just over 30,000 km2 (11,583 sq mi) in size and has a population of around 2 million.



Video Credit: ESA&nbsp;&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer 



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Lesotho: Africa's "Kingdom in the Sky"

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Dublin, the capital and largest city of Ireland. Beyond its pub culture, Dublin is known as a modern culinary destination and a UNESCO City of Literature.



"Dublin is located near the midpoint of Ireland’s east coast in the province of Leinster. The city, which covers an area of around 115 square kilometers, is bordered by the Dublin Mountains, a low mountain range to the south, and is surrounded by flat farmland to the north and west," says ESA.



"The city straddles the River Liffey, which rises in the Wicklow Mountains and flows around 80 kilometers eastwards through the city of Dublin, in which it is canalised and bordered with quays. It then empties into Dublin Bay, an arm of the Irish Sea."



Dublin has an abundance of green spaces, including one of the largest enclosed public parks in any European capital city. Phoenix Park, which was originally formed as a royal hunting park in the 1660s, includes 707 hectares of green space.



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The city of Dublin on Ireland's east coast

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the province of Zaragoza in northeast Spain. The image was captured by the Copernicus Sentinel-2 mission.



"Together with the provinces of Huesca and Teruel, Zaragoza formed the old kingdom of Aragon. Its capital, also called Zaragoza (not visible in this image) is home to around half of Aragon’s population," says ESA.



"The Ebro River can be seen winding its way through the province from west to east in this image. Between its source in the Cantabrian Mountains in the northwest and its delta on the Mediterranean coast, the Ebro River is fed by more than 200 tributaries as it flows 910 km across much of northern Spain."



Since rainfall is very scarce in this region, irrigation in the Ebro basin is critically important. In the valleys surrounding the Ebro River, many fields are used for growing crops such as corn, wheat, and barley.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The province of Zaragoza in northeast Spain

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> reveals the evolution of the Columbia Glacier in southeastern Alaska. Columbia is among the fastest shrinking glaciers in the world, and the video documents its rapid retreat over the years.&nbsp;



Columbia Glacier is a large, multi-branched calving glacier that flows out of the Chugach Mountains to the Prince William Sound.&nbsp;



According to USGS, Columbia had a long history of stability prior to 1980, with a length 41 miles, and small, short-lived advances or retreats.



In the years since 1980, however, satellite images have captured Columbia’s alarming retreat. By using false-color images, scientists can distinguish between snow and ice, open water, vegetation, and rocky debris on the glacier’s surface.



The series of false-color images featured in today's video were acquired over the span of 35 years. You can see that by 2021, the glacier’s main branch had retreated about 15 miles from its initial position.



The Columbia Glacier has also lost more than 50 percent of its volume, mostly due to calving. <a href="https://www.earth.com/video/nasa-reveals-3d-visual-of-an-atmospheric-river/">NASA</a> reports that while climate change likely started the retreat, mechanical processes kept the disintegration going.



The NASA images are provided by Jesse Allen, Robert Simmon, Joshua Stevens, and Lauren Dauphin using data from Landsat satellites, from the U.S. Geological Survey, and data from MODIS on NASA’s Terra satellite. The structure of Columbia’s moraine played a large role in the stability of the glacier before 1980. 



Like other tidewater glaciers, the Columbia built up a moraine over time, and the mixture of ice and rock functioned like a dam keeping out the sea. It was supported on one end by the shoreline and by the underwater terminal moraine at the other.



Video Credit: NASA Earth Observatory/&nbsp; NASA’s Scientific Visualization Studio



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The rapid retreat of the Columbia Glacier

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the Pyrenees Mountains, which form a natural boundary between France and Spain in southwest Europe.



The mountain range is 430 kilometers in length. It stretches from the Mediterranean Sea on the east to the Atlantic Ocean on the west.



At an elevation of 3404 meters, Pico de Aneto is the highest mountain peak in the Pyrenees, and the third-highest peak in Spain. Pico de Aneto is located in the Posets-Maladeta Natural Park, which spans more than 82,000 acres.&nbsp;



"Geological studies have revealed that the Pyrenees Mountains have been around for longer than the Alps, with their sediments first deposited in coastal basins during the Paleozoic and Mesozoic eras," reports ESA.



"The entire mountain range formed due to the upwelling of large sedimentary rocks by the collision of the Iberian and the Eurasian plate around 100 to 150 million years ago, followed by intense erosion from ice and water."



The western Pyrenees receive more precipitation due to moisture blowing in from the Atlantic Ocean. The mountain range contains many lakes, several small glaciers, and some of the highest waterfalls in Europe.



Video &amp; Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The Pyrenees Mountains in southwest Europe

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes two exoplanets that are orbiting a star 218 light-years away. A team of researchers led by the University of Montreal has found evidence that these planets are "water worlds."



The experts used data from NASA’s Hubble and Spitzer Space Telescopes. They discovered that exoplanets Kepler-138 c and Kepler-138 could be composed largely of water.



"We previously thought that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-Earths," explained study co-author Björn Benneke.&nbsp;



"However, we have now shown that these two planets, Kepler-138 c and d, are quite different in nature and that a big fraction of their entire volume is likely composed of water. It is the best evidence yet for water worlds, a type of planet that was theorized by astronomers to exist for a long time."



Video Credit: NASA Goddard



Image Credit: NASA, ESA, and Leah Hustak (STScI)



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Two distant planets may be "water worlds"

[sendtonews key="QIoVYJqRBi-2434608-12187" type="single"] Today's Video of the Day from NASA...

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Satellites reveal how Earth's systems are interconnected Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes Earth’s interconnected systems, and how this network is affected by rising temperatures.&nbsp;



During 2020, average global temperatures matched the hottest year on record. The hurricane season was also record-breaking, with many of the storms intensifying at extraordinary speeds. Hot water in the ocean is fuel for hurricanes. The satellite data shows that it's all one interconnected system showing how Satellites reveal how Earth's systems are interconnected.



According to NASA, dust swept up from Northern Africa plays a major role in the formation of hurricanes, and is also a key source of fertilization in the Amazon rainforest. As a result of<a href="https://www.earth.com/news/seagrass-wasting-disease-is-fueled-by-climate-change/"> climate</a> change, dust plumes are expected to decline, which will have an effect on vegetation far away.&nbsp;



Images from Earth-observing satellites show how the world’s plant life is affected by natural disasters, fires, and deforestation. Satellites also reveal how widespread changes in vegetation impact waterways,&nbsp; the climate, air quality. Satellites communicate by using radio waves to send signals to the antennas on the Earth. "Earth From Space" is a groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. 



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Satellites reveal how Earth's systems are interconnected

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Today’s Video of the Day from the <a href="https://welcome.miami.edu/">University of Miami</a> Rosenstiel School of Marine and Atmospheric Science explores how changes in water temperatures have affected tiger shark habitats and movements in the North Atlantic Ocean. The study reveals that rising temperatures have caused the sharks to shift toward the poles over the past 40 years.



“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” explained study lead author Neil Hammerschlag. “These results have consequences for tiger shark conservation, since shifts in their movements outside of marine protected areas may leave them more vulnerable to commercial fishing.”



The researchers analyzed nine years of tracking data from satellite-tagged tiger sharks, combined with four decades of conventional tag and recapture data provided by National Oceanic and Atmospheric Administration (NOAA) Cooperative Shark Tagging Program.



The experts found that during the last decade of record heat, for every one-degree Celsius increase in water temperatures, tiger sharks migrated further poleward by over 400 kilometers. They also migrated two weeks earlier than usual to waters off the northeastern coast of the United States.



“Given their role as apex predators, these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans,” concluded Professor Hammerschlag.



Video Credit: University of Miami Rosenstiel School of Marine and Atmospheric Science



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Tiger sharks are shifting poleward as temperatures rise

Today’s Video of the Day from the University of Miami...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> is focused on the melt ponds that emerge during the spring and summer on the Greenland Ice Sheet, which is the largest ice mass in the northern hemisphere.



"Melt ponds are vast pools of open water that form on both sea ice and ice sheets and are visible as turquoise-blue pools of water in this Copernicus Sentinel-2 image," says ESA.



"When snow and ice melts atop glaciers, water flows in channels and streams and collects in depressions on the surface. These melt ponds can speed up the melting of the surrounding ice since they greatly reduce the ice’s ability to reflect sunlight."



"This can create a positive feedback where an increasing number of melt ponds absorb more heat which causes ice cover to melt even faster."



According to ESA, Greenland has been hit with a late-season heatwave that began in early September. This caused the type of melt event that usually occurs in the middle of summer.



"In a recent paper published in Nature Climate Change, scientists found that major sea-level rise from the melting of the Greenland ice cap is now ‘inevitable’ even if the burning of fossil fuels were to halt overnight," says ESA. "Using satellite observations of Greenland ice loss and ice cap from 2000 to 2019, the team found the losses will lead to a minimum rise of 27 cm regardless of climate change."



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Melt ponds on the Greenland Ice Sheet

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes a new map of Mars that is providing insight into the planet’s watery past. The map also reveals where future missions could safely land on Mars.&nbsp;



The map has been created over the last decade using observations of water-rich rocks and mineral deposits. The images were captured by ESA’s Mars Express and NASA’s Mars Reconnaissance Orbiter.



"A big surprise is the prevalence of these minerals, with the map revealing hundreds of thousands of water-affected locations in the oldest parts of the planet," says ESA. "The new data will help answer exciting questions about Mars’ climate history, whether water was globally persistent or confined to short, intense episodes, and whether the conditions were ever suitable for life."



"Specifically, the map shows the locations and abundances of aqueous minerals. These are from rocks that have been chemically altered by the action of water in the past, and have typically been transformed into clays and salts."



According to John Carter of the Institut d’Astrophysique Spatiale (IAS), our collective understanding of Mars has been oversimplified. He explained that planetary scientists have tended to think that only a few types of clay minerals on Mars were created during its wet period, then as the water gradually dried up, salts were produced across the planet.



The new map shows that the composition of Mars is much more complicated than what we thought. For example, while many salts formed after Martian clays, there are some salts that are presumed to be older than some of the clays.&nbsp;



“The evolution from lots of water to no water is not as clear cut as we thought, the water didn’t just stop overnight. We see a huge diversity of geological contexts, so that no one process or simple timeline can explain the evolution of the mineralogy of Mars. That’s the first result of our study. The second is that if you exclude life processes on Earth, Mars exhibits a diversity of mineralogy in geological settings just as Earth does,” said Carter.



Video Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The history of Mars is much more complex than we thought

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Today's Video of the Day from the <a href="https://www.stowers.org/">Stowers Institute for Medical Research</a> describes how cavefish adapted to a sedentary lifestyle over tens of thousands of years. 



The experts found that the muscle metabolism of cavefish has been genetically reprogrammed over time. As a result, the animals have experienced major changes in their morphology and behavior. Despite these changes, however, the cavefish remain healthy and fit.



The research may provide new clues about the evolutionary consequences of prolonged physical inactivity in humans.&nbsp;



“It’s no surprise that people are moving less and less as technology has advanced,” said Rohner. “With cavefish, we have a unique system where we can study what might happen if people remained couch potatoes over very, very long periods of time.”



Video Credit: Stowers Institute for Medical Research



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Cavefish are healthy despite their sedentary lifestyle

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