(Matt Rourke | AP Photo )In this Wednesday, March 3, 2021 photo, people wearing face masks as a precaution against the coronavirus walk through a shaft of light on a street in Philadelphia. On Tuesday, April 27, 2021, U.S. health officials say fully vaccinated Americans don't need to wear masks outdoors anymore unless they are in a big crowd of strangers, and those who are unvaccinated can go without a face covering outside in some cases, too.