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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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yQLAX TIL that Jeremy Renner broke both his arms during filming of the movie "Tag". CGI was used to replace Renner's arm casts in the final film.
9YlB6 TIL about Exploding Head Syndrome, a rare condition where you hear a tremendously loud crash, buzz, or similar noise in your head as you are falling asleep. There is no pain associated and there is no harm caused as a result, but it can be quite unsettling.
Egedx TIL Cows were brought to Japan from China in the 2nd century. Until the Meiji Restoration in 1868, they were used only as draught animals, in agriculture, forestry, mining and for transport, also a source of fertilizer. Due to cultural and religious reasons, meat and milk was not consumed.
kOGZW TIL 'kahuna' is a Hawaiian word, defined as a respected person who has moral authority in society; a "priest, sorcerer, magician, wizard, minister, expert in any profession (whether male or female)". There are many different types of kahunas that represent all sectors of society and all skills.
Z8xLB TIL of the "Stoned Ape" theory of human evolution which states that early hominids ate "magic mushrooms" growing in the dung of large African Animals and this helped to rapidly evolve the human brain into a state of higher consciousness.