An employee of the National Theater displays a face mask in a costume workshop in Prague, Czech Republic. The Czech Republic has made it mandatory that all people must cover their mouths and noses in public to stem the spread of the novel coronavirus called COVID-19. Improvised methods such as a scarf or homemade mask are allowed. Recommendations vary country by country, and in the U.S. the advice has been to eschew the masks unless you are sick or caring for someone with COVID-19. However, that may be about to change.(Petr David Josek/AP)