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Til about "ulnar dimelia," also known as "mirror hand syndrome" those affected by it have 7-8 fingers on one hand (or both) with no thumbs.

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via reddit.com

vaOr TIL that strawberries are not berries, but bananas are.
grB5L TIL Michael J. Fox was not the first actor cast as Marty McFly. That honor went to Eric Stoltz, but only a few weeks into filming, director Robert Zemeckis and writer Bob Gale fired Stoltz, and replace him with Fox.
pgYO TIL Mark Twain had a near fatal heart attack in 1898 after watching a belly dancer’s routine.
4kB96 TIL in the 1950s and 1960s trucks with fogging machines that sprayed DDT would be driven through American streets to kill mosquitoes and children would run behind the trucks to play in the thick fog that was created. In 1972, DDT was banned in the United States.
9Y5P7 TIL of the sinking of the PS General Slocum, the second worst disaster in terms of lives lost in NYC, in which many people drowned because the life jackets had been filled with iron in order to meet minimum weight requirements of the time.