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TIL tennis balls were traditionally black or white. They were changed to yellow in 1972 after research showed they were more visible on television.

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R74j1 TIL: Out of respect for David Letterman, Conan O'Brien urges his audience to switch the channel and watch the final Late Show with David Letterman instead.
XEn8E TIL Elizabeth Eckford of the little rock 9 was alone on the day of that iconic photo because her family had no telephone!
Yp8OW TIL Spielberg’s Hook (1991), is the sixth highest-grossing “pirate-themed” film of all time, behind all five Pirates of the Caribbean movies.
Wk7yN TIL that British govt in India also promoted caste system by segregating people as martial and non-martial. Also, they designated people of certain castes criminals by birth
D19xp TIL During WWII, Robert Johnson II’s Permacell division of Johnson&Johnson invented duct tape as a sealant for ammunition boxes to keep them from becoming waterlogged.