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TIL one of London’s hidden rivers runs over a tube station, Sloane Square, held inside an iron conduit built in the 19th century.

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e0jDk TIL Clay and earth are eaten in some nations; either for pleasure or to suppress hunger. One such clay is Kaolin, which is sold at most markets in Cameroon and is often flavored with spices such as black pepper and cardamom. Consumption is greatest among women, especially during pregnancy.
KOAyG TIL about Emperor Pedro II of Brazil who was an avid supporter of science education and a respected intellectual in his own right. Charles Darwin himself said that “The Emperor does so much for science, that every scientific man is bound to show him the utmost respect.”
0DRv TIL that a holocaust denial group offered $50,000 to anyone who could prove that gas chambers were used to intentionally kill people at Auschwitz. They were forced by a judge to pay that money, and an additional $40,000, to Auschwitz survivor Mel Mermelstein who provided proof of that very fact.
KYW9a TIL the US flag we know today was created by a 17-year-old high school student, Bob Heft, from Ohio. In 1958, he designed a 50-star flag for a history project, earning a 'B' from his teacher. Then, Heft sent his design to the congessman Moeller that submitted it for a national redesign competition
M71Ob TIL that the earth's mantle is predominantly solid due to extreme pressure, though it behaves as a "viscous fluid" on geologic time scales.