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TIL of Tillie Anderson; the Swedish seamstress-turned-undisputed women’s cycling champion of the 1890s, who won all but seven of her 130 races before women’s races ceased in 1902. She was inducted into the US Bicycling Hall of Fame in 2000, 35 years after her death at age 90.

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4kL9X TIL of the 1955 Le Mans disaster. French driver Pierre Levegh crashed into a crowd of spectators. The crash, explosion and subsequent fire killed 84 and injured more than 120. It is still the deadliest car race crash ever.
ZpyDG TIL about Tetrachromats - people with a special receptor in their retinas that allow them to see millions of colors that most of us can’t distinguish!
lera TIL Amelia Earhart wrote a prenup letter to her fiancée, George Putnam, stating she wanted an open marriage and “I shall not hold you to a medieval code of faithfulness to me, nor shall I consider myself bound to you similarly”. Also “I may have to keep some place where I can go to be myself”.
mx41R TIL that ferrock is a greener and stronger alternative to concrete by using recycled waste and absorbing carbon dioxide in its production. However, it has not taken off yet because it cost more to make and makes use of waste steel dust which could some day have potential economic uses elsewhere.
Ox8e TIL the gang named “Cribs” evolved into “Crips” when members began carrying around canes to display their “pimp” status. People in the neighborhood then began calling them cripples, or “Crips”