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TIL when humidity is 100% it means the air cannot hold any more water vapor. The result is sweat cannot evaporate into the air causing the temperature to feel hotter.

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oBVgr TIL that tint is a mixture of a color with white, which reduces darkness, shade is a mixture with black, which increases darkness, tone is produced either by mixing a color with grey (or by both tinting and shading), and hue is how much red, blue and yellow it has.
X0J68 TIL in the 1980s, NASA had a 1-900 number which charged $2 for the first minute and $.45 for each additional minute. It allowed callers to listen in on a mission status report and mid-flight press conferences, and thousands of them heard the Challenger explosion in real time.
oR547 TIL the word "debugging" originated when Grace Hopper found a literal moth causing a malfunction in the Harvard Mark II computer in 1947 and taped it into her logbook
menE TIL There is a mental psychosis known as Jerusalem syndrome which is the phenomenon whereby a person who seems previously balanced and devoid of any signs of psychopathology becomes psychotic after arriving in Jerusalem.
lorer TIL 97% of women traveling 1st class on the Titanic survived, compared to 32% total survival rate of the passengers.