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TIL there is a bird that lacks a singing voice to attract mates -- instead it beats its wings faster than the speed of sound to create sonic booms that can be heard by all the females in the area

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ADrow TIL - Jane Austen's brother was a war hero and both of her brothers were admirals.
QQ6X TIL the worlds smallest concept gasoline engine is 15 mm long 5 mm wide and 3 mm tall. It will produce 11 watts at up to 50,000 rpm’s and it could power an LCD watch for two years on a single drop of lighter fluid.
QN4nX TIL the man who created the medical residency system for doctors was addicted to cocaine and morphine
9YemM TIL that after approximately 3,195 hours, a set of fish beat three Pokémon games, by swimming around in a tank with motion tracking. The fish tanks were mapped with directional arrows as well as the A and B buttons, and as the fish swam into a button’s mapped area, it activated the buttons in-game
OoAng TIL Viagra (sildenafil, the compound) was originally developed for the treatment of high blood pressure and chest pain due to heart disease. During the clinical trials, researchers discovered that the drug actually way more effective at inducing erections. In 1999, Pfizer sold 1bn$ worth of Viagra.