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TIL in 1999, British geneticist John Stephen Jones FRS revealed that approx.11 million of the (then) UK population of 58.7 million had a recent Black ancestor they weren't aware of. This was due to the 18th Century Black populations across the country that had been 'absorbed' into the masses...

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7KLO TIL that after observing how long guests would hold onto garbage before littering at other amusement parks, Walt Disney placed each trash can no more than 30 feet apart.
AD984 TIL that A 'kangaroo word' is a word that contains the letters of its own synonym, in order, like MAscuLinE, ChOCOlAte, cHickEN. And a double kangaroo word has two joey words, like Containter for CAN and TIN
4XdMo TIL that nearly half of all Vietnamese people have the same last name, making it almost impossible to trace an individual's heritage further than one or two generations
1Pw8 [TIL] Director James Cameron reached the Challenger Deep, the deepest part of the Mariana Trench. He is the first person to accomplish the trip solo. The data he collected resulted in interesting new finds in the field of marine biology, including new species of sea cucumber and squid worm.
neX8G TIL that a 1916 zoning law in NYC allows skyscrapers to go as high as they want as long as they cut back in on themselves. The “setback law” allows for sunlight and air to pass through to smaller buildings and street level. These tiered skyscrapers helped to give rise to the Art Deco style.