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TIL Lawrence of Arabia's death in a motorcycle accident is indirectly responsible for crash helmet 'legislation for protective headgear by motorcyclists and subsequently in the workplace and for many sports worldwide'.

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via reddit.com

kJPed TIL the pearlfish can live inside a sea cucumber's anus when it dilates to breathe. They also eat the gonads, along with other organs. Sometimes 5 or more can be in one sea cucumber.
E1AXd TIL Lydia O'Leary, a woman who was insecure due to a large birthmark on her face, created a product to hide it that was inspired by her experiments with oil paint. She was granted a patent for her concealer in 1932. It's the only foundation with a USPTO patent.
kJxLd TIL That If You Scaled The Solar System Down To 1 Millimeter, The Nearest Other Star Would Be About 23 Feet Away
WmwB TIL of Unit 731, a covert biological warfare research and development unit of the Japanese Army that undertook lethal human experimentation. A few of the experiments included vivisection without anesthesia and pressure chambers to see how much a human could take before his eyes popped out.
rRydW TIL that the word “soybean” is named after soy sauce, not the other way around.