Should you wear a face mask?

Available for over a year

Do face masks stop you getting coronavirus? You might instinctively think that covering your mouth and nose with cloth must offer protection from Covid-19. And some health authorities around the world say people should make their own masks. But expert opinion is divided. Tim Harford and Ruth Alexander unpick the arguments. (A woman wears a homemade face mask in Guayaquil, Ecuador. Photo credit:Francisco Macías/Getty Images)