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TIL that the treadmill was invented as a form of punishment for prisoners

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P1nVO TIL you can have a negative magnitude earthquake. Magnitude calcs are based on logarithmic scale so a ten-fold drop in amplitude decreases the magnitude by 1. If an amplitude of 20 mm as measured on seismic signal corresponds to a magnitude 2 earthquake then 1000 times less (0.02 mm) is mag -1.
a6oJ TIL Neanderthals used medicinal plants
GGe7 TIL in 1923, Jockey Frank Hayes had a heart attack and died in the middle of a race. His horse won the race while Hayes’ body remained in the saddle, making him the first and only jockey to win a race after death.
d815j TIL: In 1918, Iowa Governor William F. Harding signed a proclamation banning all languages other than English for public conversation, education, speeches, or church services. Some churches had to close and people were fined for speaking German on the phone.
9wpQr TIL that humans have the highest daytime visual acuity of any mammal, and among the highest of any animal (some birds of prey have much better). However, we have relatively poor night vision.