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TIL human nostrils alternate air flow every hour in order to give the other nostril a “break” from air particles, odours and other irritants. This is why, during a cold, one nostril always appears to be plugged while other is open.

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6nP7 TIL “Mark Twain” (meaning “Mark number two”) was a Mississippi River term: the second mark on the line that measured depth signified two fathoms, or twelve feet.
0yKv Til that dozens dogs that were forced to be left with police during the Katrina evacuation were executed by the police “without regard to the dogs’ size or the potential threat they might pose.”
69G4w TIL of Clint Malarchuk, a former NHL goalie. On March 22, 1989, during a game, Malarchuk's neck was cut by errant skate blade, severing his carotid artery and partially cutting his jugular vein. 300 stitches and 10 days later, he was back on the ice.
e9xn TIL Charles Steinmetz, the Wizard of Schenectady, listened to a problem generator for two days before marking a spot and telling engineers to replace sixteen windings from a field coil. He itemized the $10,000 invoice thusly: Marking spot - $1; Knowing where to mark - $9,999.
narr TIL one mathematician, inspired by Helen of Troy, proposed a standard unit of measurement for beauty called the “millihelen.” The millihelen is jokingly used as the measuring unit how much beauty is required to launch a ship.