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TIL in icthyology(study of fish), there is a field called meristics which counts the number of fins and scales to differentiate different fish species.

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xVNZD TIL The Mongols had a unique way of slaughtering animals. The animal was laid on its back, restrained, chest cut open and aorta torn, causing deadly internal bleeding. The process would keep all of the blood inside of the carcass. Then internal organs were removed and blood drained out for sausages.
W1lo TIL that during his 1955 tour in Ghana, Louis Armstrong suddenly stopped playing, moved by the fact that one of the dancers resembled his mother, who had died 20 years before. He said: “I know it now. I came from here, way back. At least my people did. Now I know this is my country too.”
J1PwQ Today I learned of Momofuku Ando, the inventor of instant noodles (ramen noodles) and the creator of the brands Top Ramen and Cup Noodles.
XERMR TIL: A study was conducted in an Australian University in 2008 found that "male science nerds" are most likely to be virgins and that female art majors were the most sexually active, but have little knowledge of what chlamydia is. The study was prompted by rapidly increasing cases of chlamydia.
dMr8 TIL in the 1863, an American aphid infestation devastated France’s grapevines, destroying the entire wine industry. It was only saved by grafting Calif. grape-rootstock onto French grapevines, making them resistant to the bugs. To this day, all French wine-grapes are still grown with American roots.