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TIL that the average height of a human being stayed constant from the stone age all the way until the 1800’s, yet the average human today is four inches taller on average than 150 years ago.

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R5bkw TIL some industries in the USA have mandatory retirement ages. Some include pilots in the airline industry at age 65(up from age 60), National Park Rangers at age 57, and Oregon Judges at age 75.
6a4X TIL Cicada song is so loud it repels the birds that would normally eat them.
e0Zvk TIL comedy writers Leonard Stern and Roger Price had an idea for a word game but didn't know what to call it. One day they overheard an actor saying he wanted to "Ad-Lib" an interview in which his agent called him "mad" for doing it. Stern and Price used that chat to call their creation Mad Libs.
rGD0 TIL that Tim Duncan (14 time NBA All Star) started out as a swimmer and only began playing basketball in ninth grade after Hurricane Hugo destroyed the only Olympic-sized pool on his home of St. Croix, U.S. Virgin Islands.
x6A6g TIL about the submarine USS R-14, who in during a rescue mission in 1921 had its fuel contaminated with seawater, cause the loss of battery power and radio communication. Its crew were able to make the 161 mile return trip to homeport by creating sails out of hammocks and blankets.