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TIL female sand tiger sharks mate with several males and their offspring devour each other in utero until only one remains and is born the victor and then the mother immediately abandons them

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XE1gr TIL that the song "House of the Rising Sun," most famously known from the recording by The Animals in 1964, is actually a much older traditional folk song with no known original artist, composer or place of origin.
v1pQr TIL of "hunger stones": the Central European practice of marking river levels with carved stones during droughts, to warn future generations that there will be a famine if the water level again gets low enough to see the carving. This has been done at least since 1115, and as recently as 2018.
rvWM TIL There is a pagoda built in 1049 from the Chinese Song dynasty and it has experienced 38 earthquakes, six floods and many other disasters, but it remains intact after almost 1000 years
ALEa TIL The Manhatten Project raised background radiation levels so much, that for a long time geiger counters were built out of pre-1940s steel, mainly salvaged from sunken battleships
j0eM TIL Prince used the heartbeat of his unborn son as part of the percussion in his song Sex in the Summer on the album Emancipation. One month before the album was released his son died of a congenital birth defect shortly after birth.