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TIL in 2017, Zac Efron nearly experienced a mental breakdown trying to achieve the 'perfect' body for Baywatch. In 2019, he admitted he never wants to be in that good of shape again, calling it an "unrealistic" ideal for men.

4XM9b TIL: One explanation why the Sun’s corona is confusingly much hotter than its surface, a long standing mystery, is packets of very hot material called "heat bombs" that travel from the surface into the sun’s atmosphere before exploding and releasing their heat.
Y7jm7 TIL In 1938 the timid Neville Chamberlain signed a treaty allowing Hitler to keep European land after a German invasion. By appeasing Hitler, Chamberlain believed he was preventing war. Historians widely regard this as a bad move. Almost exactly one year later, Hitler invaded Poland.
d8Plr TIL that, due to going hoarse while campaigning, President Gerald Ford's concession speech when he lost to Jimmy Carter was delivered by his wife, Betty
MeoZb TIL Although widely taught in schools, Tongue Map or Taste Map has been scientifically disproven by later research; all taste sensations come from all regions of the tongue, although different parts are more sensitive to certain tastes.
BrPnW TIL in 1963 Italian engineers underestimated the effects of a controlled landslide they’d planned, resulting in a shockwave 2x the intensity of Hiroshima, instantly pulverizing thousands of people & causing a 820ft tsunami to travel down a mountain, turning the town beneath to a “large muddy crater”