A new study published in the journal The Lancet Infectious Diseases has found that Covid-19 vaccines cut the potential global death toll by more than half in the first year in which they were available. By modeling the spread of the disease in 185 countries and territories, the experts discovered that without Covid vaccines, 19.8 million more people would have died between December 2020 and December 2021.  “We knew it was going to be a large number, but I did not think it would be as high...