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Harvard prof: People who are 'out for a jog with no one around' should wear a 'two- or three-layer cloth mask'


How many layers are reasonable?

Photo by Alexi Rosenfeld/Getty Images

In a pitch to get more Americans to wear more effective masks or double up on masks, one Harvard professor is urging people to really go all in on wearing multiple-layer face coverings.

Even if you're outside jogging ... and you're alone ... with no one around.

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