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TIL the United Nations defines youth as persons between the ages of 15 and 24.

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epEZ4 TIL of a Lithopedion, a calcified stone foetus caused from a rare complication in abdominal pregnancy (which, in itself, is rare).
rNmEy TIL about Eurypterids, or "sea scorpions", the largest known arthropods ever to have lived. The largest, Jaekelopterus, reached 2.5 meters (8.2 ft) in length. Many forms lived in brackish or fresh water, and their dual respiratory system allowed for short periods of time on land.
QZmX TIL that in January of this year, scientists in Antarctica discovered fish and other aquatic animals living in a subglacial lake, beneath a roof of ice 740 meters thick.
weJ TIL - The US Military is purchasing Abrams tanks, 105MM Howitzers and everything in-between for ‘homeland defense missions, domestic emergency responses, and providing military support to civil authorities.’ Seriously… Read the procurement lists.
R7P68 TIL every single Ballon d'Or winner since 2009 has played for either Real Madrid or Barcelona