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TIL it was first assumed that the sharks in the freshwater Lake Nicaragua were an endemic species, but it was later observed that the sharks were able to jump up and down the rapids of the freshwater San Juan River (which connects Lake Nicaragua and the Caribbean Sea) like salmon.

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nWkoP TIL of John Andaman, the name given to the first Andamanese man captured by the British during their colonization of the islands in 1857. Though amazed by British Calcutta, he quickly grew ill with foreign diseases, and was returned to his home to advocate for British rule. He was never seen again.
WkGro TIL That the world's largest largemouth bass ever caught is not actually the current world record because the fisherman "foul hooked" the bass (caught it by hooking it accidentally).
V7eZ TIL Sir Hugh Beaver, of the Guinness Breweries, got into an argument over which was the fastest game bird in Europe. There was no book in the world with which to settle arguments about records and questions debated nightly in pubs throughout Ireland. Guinness World Records was born.
pY1rb TIL that the Mpemba effect is a phenomenon where hot water can freeze faster than cold water under certain conditions, contradicting our intuition about thermodynamics.
xVvV1 TIL Okinawans in Japan are the only human population to have a self-imposed habit of calorie restriction. They believe in eating until they are 80 percent full and has the world's highest proportion of centenarians