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TIL Tooth Enamel (apatite) is not hardest biomaterial, the hardest biomaterial belongs to the Gumboot Chiton, a marine mollusc that has teeth made of Magnetite

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AZ7g TIL Charlie Chaplin would audition actresses using a “casting couch” like method, where he would prompt them to undress using caption cards and mime. He would then fondle their breasts, and once they were completely naked, he would throw pies at them.
WkEJB TIL Olive Oyl was a main character for 10 years before Popeye's 1929 appearance.
lA41 TIL actor Martin Sheen has been arrested a total of 66 times for protesting and acts of civil disobedience - most recently in 2007 for trespassing at a Nevada nuclear test facility.
loj9V TIL only four people have been at the bottom of the Mariana Trench, called the Challenger Deep (about 11000 meters or 36000ft down). For reference, 12 people have walked on the Moon.
MxR7 TIL that in the US Civil War, the Union dug a mine-shaft under a heavily defended Confederate position, and then detonated 8,000 pounds of gunpowder, instantly killing ~300 Soldiers and starting a battle during the Siege of Petersburg