Bill Hanage, associate professor at Harvard’s T. H. Chan School of Public Health, got a lot of attention for a selfie in which he proved he’d been wearing a mask while running earlier. He’s written a thread about the responses he’s gotten, but we’ll abbreviate it a bit.

And seeing a person wearing two masks means they are looking out for you twice as much. Here are some of those comments Hanage received on his selfie.

Some “science-savvy senators” are now doubling up, probably because of the “chemical warfare” being waged by their colleagues.

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