Americans have an easy way to crush Covid-19 -- one that would let businesses fully reopen safely, ditch the need for social distancing and restore a mask-free return to normalcy. But many Americans don't want to get vaccinated as myths and misunderstandings spread. "Facebook runs a survey every day ... and that's shown that vaccine confidence in the US has been slowly but steadily going down since February," said Dr. Christopher Murray, director of the University of Washington's Institute for Health Metrics and Evaluation. "We were at 75% of adults saying they wanted the vaccine. Now we're down to, in...