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In 1937, two researchers had a kind of dangerous idea.

So they figured the perfect place to test it out was in an elementary school, on kids, on the eve of a massive epidemic.

At this point, scientists had already known for decades that ultraviolet light could

kill bacteria in test tubes or on surfaces. But William and Mildred Wells, this

husband and wife team, they had a theory that went way beyond established science. They thought infectious diseases might be able to

linger in the air for hours, which would mean that what happened to bacteria in

test tubes or on countertops, barely even mattered.

So the Wellses came up with a way to try and kill bacteria in the air.

...