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TIL A professor is able to predict with 91% accuracy if a married couple will stay together based on the number of positive comments they make to negative ones. Couples with a 5:1 ratio tend to stay together.

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neoRB TIL, that few days after Chernobyl disaster, all children in Poland were given Lugol's iodine. This was one of the few cases, when Polish communist government, despite official denials of the Soviet side and against their recommendations, took action in the best interest of their own citizens.
6EB4m TIL that tomato sauce is not Italian at all but Mexican. The first tomato sauces were already being sold in the markets of Tenochtitlan when Spaniards arrived, and had many of the same ingredients (tomatoes, bell peppers, chilies) that would later define Italian tomato pasta sauces 200 years later.
9Y6MQ TIL that during Hurricane Sandy, one of the Sentinels that guard the Tomb of the Unknown Soldier, Sergeant Shane Vincent, volunteered to stand watch over the Tomb for a full 23-hours.
KOpeQ TIL: The Mongol Empire once extended over an estimated 9.27 million square miles (24,000,000 km2), which is about 17.8% of Earth's total land area, almost 5x larger than 'Pax Romana' Rome.
Dl6P TIL: Floyd Thompson was the longest held prisoner of war in US history, spending nearly nine years in captivity in Vietnam. When he returned, his wife was living with another man and of his 3 children, only his eldest child barely remembered him. Within 4 years of rescuing, he attempted suicide.