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TIL that in 1916, Nikola Tesla invented a unidirectional flow valve with no moving parts, by making the flowing substance resist its own movement.

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OolA7 TIL of "A Village Fair with a Church Behind": a 1643 painting by Isack van Ostade owned by Queen Elizabeth II. When conservators cleaned the painting, they discovered that a bush in the foreground had been painted over the original around 1903; they removed the bush which revealed a pooping man.
5EDB TIL it’s illegal in 7 US states to be atheist and hold public office.
Lb0P TIL that the IRS defined the complexity of the tax code as the #1 most serious problem facing tax-payers.
0wngp TIL that Damselfish not only grow algae farms for food, but also domesticate shrimp to fertilize the algae farms. In return, the shrimp are given a safe haven to live – the fish will chase off any shrimp-craving predators that swim too close.
n8KW TIL When That 70s Show started, the directors required all actors to be 18 or older. Mila Kunis, 14 at the time, told the casting directors she would be 18 but did not say when. Ashton Kutcher, Kunis’ boyfriend in the show, was 20 years old at that time.