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TIL prehistoric hunter-gatherer tribes had an average group limit of 50 people. Incidentally, modern research shows that in the video game World of Warcraft, maximum group player cohesiveness occurs at a limit of 50 players.

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GYkBG TIL that new ponds can be naturally stocked with new fish through birds carrying fish eggs from one pond to another on their feathers or feet.
oB7wK TIL that in 1959, Martin Luther King Jr. made an impromptu stop at the Tohono O'odham Indian Reservation to meet with tribal leaders whom he was "fascinated" by. This visit would later lead Dr. King to speak out against the government's treatment, both past & present, of Native Americans.
6Yv8 TIL a study found that semen contains mood altering chemicals which can reduce depression, increase affection and help with sleep.
GQNE TIL the FBI spend years trying to decipher two notes left by a murder victim who couldn’t write.
xNK1 TIL Henry Ford once refused to pay $10,000 to General Electric for fixing a generator problem and asked for an itemized bill. The engineer from the job, Charles Steinmetz, sent this: “Making chalk mark on generator, $1. Knowing where to make mark, $9,999.” Ford ended up paying the bill.