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TIL that research shows that people who laugh at dark jokes have higher IQs and report less aggressive tendencies .

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xVyrb TIL men can be allergic to their own semen, which can be remedied by desensitizing them to it via repeated injections of small diluted doses of it under their skin.
EgVv0 TIL that in 1856, an American stole a slice of watermelon in Panama City which resulted in a riot that killed 17 people and left at least 63 others wounded.
dDaW7 TIL breeder reactors are nuclear reactors that generate more fissile material than they consume
Z8VRQ TIL MIT lawyers did not patent turn-by-turn in-car navigation in 1989 because "This will never happen.. because the insurance companies won't allow it"
NXZjE TIL the town of Arco, Idaho has a mountain called Number Hill. In 1920 the senior class of Arco High School painted a large 20 on the mountain and since then every graduating class has added their number to the mountain.