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TIL hawkmoths rapidly rub their genitals in order to create ultrasound bursts. This confuses bats and effectively makes the moths invisible

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W7dQB TIL the shade of semen naturally changes over the course of a man's life.
WQgN TIL the vibrator was invented for doctors who were getting carpel tunnel from using their fingers to give female patients orgasms in order to treat hysteria.
D1Adg Try these 11 expert tips for a better shower; your skin will thank you
JnpQ TIL that the word “dude” is actually a Scottish word, from ‘duddies’
9YlDB TIL that digital cameras were developed so spy satellites could send images back to earth more quickly. Before digital cameras in 1976, spy satellites used film. After the film was shot, the satellites loaded the footage into capsules and dropped them from orbit into the atmosphere for collection.