How quickly we forget. When the coronavirus pandemic started, public health experts warned that vaccines were unlikely to become available for years. Having vaccines within 18 months was considered a wildly optimistic estimate. (Those experts were not just being killjoys—ensuring that a vaccine is…

Check out our entire series explaining the science involved in the coronavirus pandemic. Sign up to receive our coronavirus update each week. We all really, really, really want this pandemic to be over. If we could somehow go back to the Before Times, when most of us had never…