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TIL that teenagers' brains are more tuned into unfamiliar voices than their mothers' voices. This shift occurs around ages 13-14 during puberty, helping teens expand their social connections beyond their family.

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8eloP TIL the peace symbol was designed by Gerald Holtom in 1958 and is a super-imposition of the semaphore signals for the letters "N" and "D", taken to stand for "nuclear disarmament".
grWw4 TiL that the spiral shell of a Nautilus cephalopod isn't full of its body, but a system of air chambers that act like buoyancy chambers on a submarine!
X00LP TIL George E. Edmondson Jr., "Mr. Two Bits", was an unofficial cheerleader for the Florida Gators college football team. He led a traditional "Two Bits' cheer" at almost every Gator home game from 1949 until his retirement in 2008.
kEv7 TIL that Norway invests 60% of its oil fund of $855 billion in equity in non-Norwegian companies like Apple, Activision Blizzard and CBS Corporation
R5v8 TIL that a person’s willpower is directly linked to their glucose levels. So people quitting smoking, when you get a craving just have some jelly beans instead.