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TIL the book 'Theory of Games and Economic Behavior', by mathematician John von Neumann and economist Oskar Morgenstern, led to the creation of an entirely new field of research, known as game theory, which is the study of mathematical models of strategic interactions.

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0wX0v TIL of Raoul Wallenberg, a Swedish special envoy who assisted in saving thousands of Jews from the Holocaust, often singlehandedly pulling Jews from train cars right under the noses and arms of the Nazis.
QJJya TIL the use of bowls to house goldfish comes from a misunderstanding of Chinese display vessels--small, temporary containers to show guests goldfish that were otherwise housed in ponds. Fishbowls are so detrimental to goldfish health that they are prohibited by places like Rome for animal cruelty.
nekQ9 TIL of Anastenaria,a traditional ritual in Bulgaria and Greece in which participants dance for hours while carrying the icons of the patron saints until entering a state of trance,after which they walk barefoot on burning charcoals without getting burned.
kOOlg TIL Elvis Presley and his entourage would rent out roller skating rinks to throw $15,000 worth of fireworks at each other while wearing "air force jump-suits plus gloves, helmets, and goggles."
Bgrlb TIL the hummingbird brain is 4.2% of its body weight, twice higher than the human brain at only 2% proportionally.They remember well their migration routes, and the yard and flowers they visited the previous year. Some consider them sacred, and in mythology they are healers helping people in need.