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TIL scientists created a mouse colony that started with 4 males and 4 females. The colony peaked at 2200 and from there declined to extinction. When 'overpopulation' was reached, most of the mouses stopped reproducing and "just ate, slept, and groomed."

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XE4mr TIL that the facial expressions we make are hardwired into our brains rather than learned during life. After comparing the expressions of sighted and blind athletes at the 2004 Olympic games, researchers concluded that both competitors showed or controlled their expressions in exactly the same way.
KO5gR TIL of the Battle of the Wabash or St. Clair's defeat. When an American army of 1000 men was slaughtered by a Native American force of near equal strength in 1791. Only 28 men escaped unscathed with a casualty rate of 97%, it remains the largest defeat in American history.
vPg6B TIL of Stubbins Ffirth. While in school he theorized yellow fever was not contagious, and was spread by heat and stress. He poured blood, vomit, and urine of the infected into his eyeballs and cuts and did not become sick, believing his theory to be true. It was later shown to be spread by mosquitos
d878d TIL about the Battle of Camaron, where 64 French Foreign Legionnaires resisted to 3,000 mexican soldiers for a whole day long. The 3 last legion survivors, heavily wounded, refused to continue the fight at their own terms.
mxPOP TIL the first Nobel Prize was awarded to Henry Dunant for founding the Red Cross