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TIL the sex of alligator hatchlings is based purely on temperature while incubating. At 86F or lower, the babies will all be female; at 93F or higher, they will all be male. The mother can sense these changes in temperature and will alter the nest to maintain an optimum temperature.

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ZpXmQ TIL The Simpsons' show-within-a-show, "The Itchy and Scratchy Show", isn't actually based on Tom and Jerry. It's based on a more obscure cartoon called "Herman and Katnip," which was notorious for being violent and mean-spirited.
mxlEx TIL a UFC fan happened to get fighter Rory MacDonald’s old cell phone number and was selecting Rory’s walk out music via text messages without Rory or the UFC finding out for years.
KRl6 TIL in Paris in 1910, engineers had to freeze the Seine (river) along 64 meters to dig the tunnel for the subway going underneath it.
a709 TIL that in 1952 while in an institution Charles Manson held a razor to another boy’s throat while he sodomized him before being released on parole in 1954.
jNO9X TIL. Spain fought the longest and most expensive war of their conquest of modern day Mexico against the Chchimecas. They ultimately gave up and negotiated peace, ensuring the preservation of their culture into modern times and becoming one of the few pre-Columbian culures to fully survive