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The public health debate on masks is settled, said Joseph G. Allen, director of the Healthy Buildings program at Harvard. When you wear a mask, “You protect yourself, you protect others, you prevent yourself from touching your face,” he said. And you signal that wearing a mask is the right thing to do.

With coronavirus cases still rising, wearing a mask is more important than ever. In this animation, you will see just how effective a swath of fabric can be at fighting the pandemic.