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TIL all Marbled Crayfish are genetically identical, reproducing asexually. It is the only known decapod to do this. They have no known natural population and their origin is unknown, first appearing in German pet stores in 1995

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9Y9aX TIL Japanese Gen. Kuribayashi knew he was facing unsurmountable odds during the invasion of Iwo Jima. He forbade standard Japanese banzai charges, leading an American general to say he was "one smart bastard." At the end, he inflicted 26k American casualties while fighting with "emaciated men."
xvQg TIL in 1976 a film crew went to the haunted house in a California amusement park to shoot footage for a popular tv show. They discovered a hanging body that they thought was a mannequin… turns out it was a real person who had been dead and circulating in various carnivals for over sixty years
9YWeB TIL in 1889, President Harrison signed identical documents that created North and South Dakota as states. No one knows which state was the 39th or the 40th to enter the Union because Harrison signed the documents blind and declared, “They were born together; they are one and I will make them twins."
ADynw TIL that there is only one genus known to science in which the female has a well-defined organ that can be described as a penis. Neotrogla is a genus of barklice that consists of 4 species, all native to Brazil. Via penises, females drain males of seminal fluid when they are too young to reproduce.
VMP8G TIL that during WWII, the US military developed a manual to sabotage German corporations, with tips such as "Do your work poorly and blame it on bad tools. Work slowly. Bring up irrelevant issues as frequently as possible. Spread rumors. Haggle over precise wordings. Never permit short-cuts."