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TIL that children (and adults) in the US were tattooed with their ABO Blood group and Rhesus factor(Rh) by schools in the 1950s. With Cold War at its peak, children were included in this program to cover potential shortages in blood banks in case of a Soviet Union attack.

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D1Mpv TIL: Computer programmer hired woman to slap him in the face every time he used Facebook, resulting in massive productivity increase.
alWN TIL that one theory on why we live in three dimensions is that when the Big Bang occurred, only 3 of the 9 spatial dimensions expanded infinitely.
XEeyQ TIL Coke was sued for the "unwarranted health claims" on their product Vitamin water. Coke's defense was "no consumer could reasonably be misled into thinking vitamin water was a healthy beverage."
ZJ4o TIL Kevin Mitnik served 8 months of his prison sentence in solitary confinement because the judge believed that if allowed access to a telephone Mitnik could start a nuclear war by just whistling into it.
wQQ7 TIL In 1990 Muhammad Ali went to Iraq and negotiated the release 15 United States civilians being held captive by meeting personally with Saddam Hussein