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TIL that The Smallest Computer in the World Fits On a Grain of Rice

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Z8rao TIL bladeless fans work by squeezing air & accelerating it. Air is forced out through slits, & clings to the curved aerofoil surfaces. This means surrounding air pulled along, too. The air flow becomes about 15 times greater than the air taken in.
WQBY TIL that ¾ of American lesbians are overweight.
GYKmQ TIL, the Black Death disproportionately killed frail people. Moreover, people who lived through it lived much longer than their ancestors (many reaching ages of 70-80), not because of good health but because of their hardiness to endure diseases. This hardiness was passed on to future generations.
9Ym1r TIL when a chimpanzee that learns an effective method to crack nuts open is placed into a new group that uses a less effective strategy, it will eventually stop using the superior method just to blend in with the rest of the chimps.
E1J4P TIL of the Heckler's Veto, where a speaker's freedom of speech is allowed to be impeded on if people who are listening are audibly overpowering the speaker.