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It doesn't just work your leg muscles—racing is rough on your intestines, too.

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D1Nar TIL in the 1910s there were cases of people using the postal service to mail their children across long distances because postage was cheaper than a train ticket
b9xQ4 Today I learned that most gelatin ( used to make gummy things and jello) is made from boiling cow's skin, ligaments and bone
4gG6 TIL according to neuroscience recordings of brain waves Matthieu Ricard, a buddhist monk, is literally the happiest person ever tested.
yVjNe TIL about the artist August Natterer, who suffered from Schizophrenia, On 1 April 1907, he had a hallucination of the Last Judgment, in which he saw "10,000 images [flash by] in half an hour." He then spent his life creating art from the images he saw, under the pseudonym 'Neter'.
mxRjp TIL that the US government used an Atomic Bomb to launch a manhole cover 125,000 mph (201,160 kph), that is the fastest that a man-made object has traveled. It is also said that it beat the Sputnik to space, although that was never confirmed.