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TIL there was an experiment where 2 groups of 11-12 yr old boys were given separate camps in a state park. When the groups became aware of each other they began raiding each other’s camps, which led to physical combat. The investigators ended the experiment for fear someone would get seriously hurt.

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8aEXL TIL that buccaneers derived their name from the Arawak word for buccan, a wooden meat smoker. This smoked meat was purchased largely by Caribbean privateers who eventually gained the nickname.
6Ea5m TIL a donkey can mate with a zebra and produce an offspring called a "zebrass".
WkeNL TIL there are 7 days in a week thanks to the Babylonians, who lived in modern-day Iraq. As keen observers of the heavens, the Babylonians adopted 7 days because they observed 7 celestial bodies — the Sun, the Moon, Mercury, Venus, Mars, Jupiter, and Saturn.
kOXLW TIL the word "Walkman" became so popular in the German language as a generic term for a personal stereo that in 2002 the Austrian Supreme Court ruled that any brand, not just Sony, could use that word to describe such a device.
O6Xg TIL that Tyrannosaurus Rex is only the 14th largest predator to have ever been on Earth. The sperm whale is actually the largest.