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TIL in 1980s when a baboon troop was hit by a outbreak of tuberculosis killing all of its aggressive alpha males, the remaining passive males which were bullied by previous alpha males transformed the troop from an aggressive and violent troop into a peaceful one, which had never been seen before.

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XBjD TIL of the Carolina Butcher, a 9-foot bipedal croc that probably ate armored reptiles
ANrMx TIL October 8, 1871, there was a wildfire in Wisconsin called the Peshtigo fire. The Peshtigo fire is the deadliest wildfire in recorded history, but news about it was overshadowed at the time by another fire happening elsewhere on the same day—the Great Chicago Fire.
x8do TIL that one of the first prototype looping roller coasters had a perfectly circular loop. As a result, riders were exposed to approximately 12gs of force, and frequently suffered neck injuries while riding. The modern roller coaster loop uses a “tear drop” shape to reduce G forces significantly.
j69eX TIL of the Watermelon Riot, in which a stolen watermelon slice led to 17 deaths and property damage
16588 TIL that in 1995 BMW released 120 limited edition M3's called the "Lightweight". (Of which Paul Walker owned 5) These cars shipped with extra performance parts strictly for "competition use only" with a letter stating that installing the provided parts would void your whole warranty on the car.