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TIL 'Plankton' is not a single species, but is instead an umbrella term used to refer to any lifeform that drifts with the ocean currents, including microorganisms like bacteria and algae, as well as larger creatures like jellyfish.

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xDM0 TIL Andrew Jackson participated in the American Revolution informally at age 13 as a courier, survived being captured by the British, and was the only member of his family to survive the revolution, becoming an orphan at age 14.
OoBeY TIL that the word with the most meanings in English is the verb 'set', with 430 senses listed in the Second Edition of the Oxford English Dictionary, published in 1989. The word commands the longest entry in the dictionary at 60,000 words, or 326,000 characters.
mxAPR TIL of bematists of ancient Greek and Egypt, trained professionals who were hired to measure distance by counting their highly accurately spaced steps. The mathematician Eratosthenes worked out the circumference of the Earth using bematists' work.
BrEnd TIL female fish can fake an orgasm to trick the male into thinking they've successfully mated and swim off to find a better partner.
jNZEN TIL that Pepsi once offered a Harrier Jet for 7,000,000 Pepsi Points. One man ended up suing Pepsi after he tried to cash in his points for the jet but never received it.