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TIL masturbation can begin as early as still being in the womb. Although babies of both sexes are known to masturbate in utero, boys are the only ones who can be caught while aroused via ultrasound

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VMMnk TIL the extension ladder was invented by 16 year old Henry Quackenbush who later went on to invent the modern nutcracker.
W7Yx4 TIL that the Sun's atmosphere is hotter than its surface
J1aAk TIL Sea Otters use rocks as tools.
jkMR TIL The world’s first theater devoted exclusively to moving pictures appeared in Pittsburgh in 1905. Its founders called the place Nickelodeon, from the price of admission (a nickel) and “Odeon” the ancient Greek word for theatre.
b9vm7 TIL that a wild western gorilla in the remote Congolese forest was observed using a stick to test water depth before crossing a pool of water and then used the same stick as a walking stick whilst crossing the pool. Another gorilla was observed using a tree trunk as a bridge to cross a deep swamp.