When we came up with this idea, “Masks are here to protect against your own unwashed hands,” the idea about asymptomatic transmission, about aerosol, and so on, all these are just being investigated. It was really early. It was January, early February. Nobody disputes that if you touch a surface and put your face to your own hands, that’s a very likely vehicle of transmission, and masks stop that and then reminds you to wash your hands.

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