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TIL that during the fall of Saigon in April of 1975, the American radio station played "White Christmas" to signal American troops to immediately move to evacuation points

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yQdkV TIL that both humans and domestic dogs elicit a dramatic increase of oxytocin, the bonding hormone, from the other when staring into each other's eyes. Similar to a human mother and her infant.
D1MXr TIL that Betty Crocker was never a real person. She was created for a Gold Medal Flour ad in 1921. Shortly after the company decided to use the character to answer all the baking and cooking questions received by mail, as a woman was a more trusted source of baking information than an all male staff
QJkmX TIL Human kidneys can only make urine that is less salty than salt water. Therefore, to get rid of all the excess salt taken in by drinking seawater, you have to urinate more water than you drank. Eventually, you die of dehydration even as you become thirstier.
dVjK TIL a few of Cambodia’s Khmer Rouge soldiers were found hiding in jungle as recent as 2005, completely unaware Pol Pot died and Vietnamese troops no longer occupied country
ANkwo TIL of Malthusians. They believe a finite earth can’t sustain mankind’s indefinite expansion unless checked by law, war, famine, or natural disaster