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TIL of trisodium citrate, a citric acid added to cheese to make it meltier and non-greasy. Its chemical formula literally spells NACHO.

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X8Nj TIL the chemical composition of emotional tears differs from those secreted due to irritation (such as tears caused by onions). Emotional tears include more protein-based hormones such as prolactin and leucine enkephalin, a natural painkiller that acts as the mechanism that allows one to feel better
QNvgL TIL about Operation Meetinghouse, the deadliest bombing raid in history. On March 10, 1945, U.S. bombers dropped incendiary bombs on Tokyo, resulting in the deaths of over 100,000 people and the destruction of 267,171 buildings. This raid was even more destructive than the atomic bombing
0wdXR TIL same-sex marriage is not legal in any Asian country, and is only legal in one African country (South Africa)
PYGdJ TIL Humans almost became extinct about 70,000 years ago when the total population dropped below 2,000.
PYylJ TIL that after screening the movie WarGames at Camp David, President Reagan was inspired to learn more about America's vulnerability to cyberattack. The response: "Mr. President, the problem is much worse than you think."