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Should you wear a face mask?
Tim Harford looks at the debate over making your own Covid-19 protection.
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.
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Tim Harford explains the numbers and statistics used in everyday life.
