How well a mask works depends on how well it fits

At this time last year, it would have been unthinkable to see near-universal face mask wearing across North America. But that’s now the norm, especially in big cities. The change was rapid and swift and now, months into this new behavior, there’s still no standard for what makes a good mask, although we can tell you what makes a bad one. Popular Science asked a few experts for their top mask tips to help you and your loved ones stay safe.

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