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TIL 35% of whole blood donors become iron-deficient (defined as ferritin levels of below 25 µg/L). Daily iron supplementation (37 mg of iron) for at least 8 weeks after is expected to replenish iron loss from one whole blood donation.

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6Egv8 TIL that in "Man on the Moon", Jim Carrey and Jerry Lawler had an actual feud. Carrey spat in Lawler's face and got him fired. When Lawler was rehired for the Letterman segment, he retaliated by slapping him as hard as he could - much harder than he slapped the real Kaufman during their fake feud.
Wkm9d TIL of Rhea Clyman, a Jewish Canadian Journalist who travelled to the Soviet Union and made reports on the Siberian labor camps and the Holodomor. This led to her deportation in 1933 after which she reported on Nazi Germany until 1938 when she was forced to flee due to growing anti Semitism.
Wkol4 TIL Tom Hanks was paid a low $800 for the movie "He Knows You're Alone", $50,000 for "Toy Story" and a high of $70 million for "Forrest Gump".
8RgX TIL in 1883, a pamphlet was published with three coded pages known as the Beale ciphers. These pages are supposed to have the location of a hidden treasure worth about $63 million. Only the second page has been solved and it is thought that the treasure is located in Bedford County, Pennsylvania.
woj4o TIL of Kamo Ter-Petrosian, an infamous leader of a Bolshevik gang. Kamo would often test newcomers by ambushing them and putting them through a fake execution. When a recruit revealed himself to be a spy, Kamo had him shot, then tore out the man's heart and showed it to other recruits as a lesson.