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TIL about the origin story of mosquitoes from the Tlingit tribe of Alaska. A young man got revenge on a cannibal which had killed his two older brothers while they were out hunting. After he burned the cannibal's body into ashes, he blew on the ashes and they flew off, turning into mosquitoes.

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PYBGw TIL about Jan Davis and Mark Lee, two NASA astronauts who were secretly married shortly before their launch on the space shuttle, becoming the only married couple to travel to space together
nvkb TIL in 1934 Philo Farnsworth and RCA went to court to establish whose patent marked the beginning of TV broadcasting. In court, Farnsworth’s high school physics teacher testified that the boy, at 14 years old, first described to him the idea for a scanning tube, better known as a television.
kJdZ1 TIL the Giffen Goods. These are poor-quality goods that defy standard economic behavior and whose demand increases as prices rise. Despite the substitution effect, the income effect of higher prices leads to greater consumption of the commodity.
QBG9 TIL firing squads issue a blank cartridge to either all-but-one, or one-but-not-all, of the members. No member of the squad is told beforehand if he is using live ammunition. This is called the “conscience round” which allows each member to believe they did not personally fire the fatal shot.
LQMpQ TIL with Scallops, only the abductor muscle is eaten by humans. The rest of the meat, which is edible, may contain a buildup of toxins, and is discarded at sea.