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TIL: Giraffes tongues are blue because when feeding, their tongues are frequently out of their mouths and exposed to sunlight, so the dark coloration serves to prevent them from getting sunburned.

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R5wZQ TIL that Emperess Wu Zetian of the Tang is the only female Emperor in all of Chinese history.
5YynP TIL the data connection between the ISS and other modules is just plain old ethernet via the International Docking System Standard connector (page 73)
Oo9B1 Today I Learned That There Are More Than 5 States Of Matter Other Then Solid, Liquid, And Gas Which Include “Plasma”, “Bose-Einstein condensate” And Many More.
YpgNW TIL Sigmund Freud's development of psychoanalysis, including concepts such as the id, ego, superego, and libido, was all done under the influence of a constant supply of cocaine, which he advocated unreservedly, and even endorsed for cash.
KONA4 TIL before Judy Garland landed the role of Dorothy Gale, it was offered to Shirley Temple, and Deanna Durbin. Temple would have played the role if her studio let her out of her contract, and Durbin flat out refused the role.