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TIL that a fossil of a spider with an erection exists

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J17a8 TIL A German horse was taught math.. except it was later found that the horse had learnt to recognise human reactions to its answers and was just "counting up to the answer" until it got the right reaction
mxDeo TIL there is an event in history called "The Great Stink". In 1858, central London got so stinky because of untreated sewage, that it became unbearable for local population. Incidentally that event became starting point to modernize sewage treatment as we have it today.
6E6yY TIL American Moose and European Elk are the same species and are only named differently due to language errors.
nbDo TIL In 1918, a black man named Laurence C Jones survived a lynching attempt from a white mob by convincing them of his passion to educate Black kids. The mob ended up collecting money for his cause.
Zv0p TIL that Blue whales are among the loudest animals on the planet, and might hear each other up to 1,000 miles away.