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TIL that Samuel Rowbotham who created the Flat Earth Society dropped out of school at the age of 9.

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epBe5 TIL Roman concrete's durability is a result of hot mixing, which creates lime clasts that "self-heal" cracks whenever they are exposed to water.
woeJ1 TIL of Lazarus and Joannes Baptista Colloredo, Italian conjoined twins who toured freak shows in 17th-century Europe. As reported by Henri Sauval, Lazarus was sentenced to death for killing a man, but averted the execution by pointing out that this would also kill his innocent twin brother.
m8x TIL that General Butt Naked would drink the blood or eat the heart of a small child he’d hunted down before going into battle naked except for sneakers and a machine gun, was responsible for 20,000 civilian deaths, and after converting to Christianity has yet to be prosecuted for war crimes.
VMdGk TIL Lyrebirds are nature's masters of mimicry and are capable of imitating almost anything, even chainsaws and building sites.
WMPX TIL Patrick Stewart left his bags unpacked for the first six weeks of filming Star Trek: TNG because he thought the show would fail.