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>> if that person had used hand hygiene, that would have prevented the whole line from becoming contaminated. >> reporter: this shows how the invisible enemy spreads when we talk. one person talking loudly for one minute in a confined space can givenerate 1,000 droplets. a speaker repeats one phrase. >> stay healthy. >> reporter: inside the box thousands of dropless can be seen stirred by a fan which is turned off. the clock up top shows how slowly the droplets dissipate. some circulate for 12 minutes. that's plenty of time for infected particles to be inhaled by others. >> in a loud restauran...

>> tucker: joe biden's attendance let him off the leash

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Are more effective, but that doesn't mean we should dismiss the benefit of cloth masks. let me show you. take a look at this experiment done by researchers at the national institutes of health. they use lasers to show how far spit droplet travel through the air when we talk. watch how far those green dots go when he speaks. without the lasers, these droplets might be invisit to invisible to the naked eye. with the cloth, we barely see anything. >> come out in the form of a gas cloud. the wearing of mask could be a way to contain the range of that cloud. >> lydia is a professor at mit who studi...

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