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TIL that while men only need 8mg of iron a day, women need about 18mg a day. This is to compensate for the amount of iron women lose during menstruation. About 1mg of iron is lost for each day of a women's period.

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8e8dX TIL of “The Pittsburg Windmill”, the boxer Harry Greb who boxed with one eye after losing sight in the other due to an injury. Despite this, Greb was the only person to defeat champion Gene Tunney and was renowned for breaking the colour line by accepting challenges from African-American opponents.
Oopv1 TIL that in 1921, spiritualists Thomas Lynn Bradford and Ruth Doran decided to test whether it was possible to communicate with the dead. Bradford killed himself by sealing his apartment and turning on his gas stove, and planned to appear as a ghost to Doran after his death. He didn't.
GPKG TIL a man named Jerry Gretzinger has been drawing a map of an imaginary world for over 50 years. He draws from a deck of cards each morning to decide the fate of his hand-drawn world, which is over 2000 square feet in size.
KODx4 TIL Bobby Leach, the 2nd person to go over Niagara falls in a barrel and survive, spent six months in the hospital recovering from his injuries. He traveled the world recounting his ordeal in vaudeville shows. Years later he slipped on an orange peel, injured his leg, and died from complications
QNX4a TIL: Some oil wells are drilled to a depth of 3 miles and the predictable total of U.S. oil production in 1944 was 1,601,2500,000 barrels.