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TIL of Theophrastus Phillipus Auroleus Bombastus von Hohenheim, a physician from the 15th century who said “All things are poisonous and nothing is without poison; only the dose makes a thing not poisonous”. He is regarded as the father of toxicology.

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rNdN0 TIL the word Pope comes from the Greek word πάπας (papas), best translated into English as "daddy"
gMeE4 TIL: Helium is the only element that was not first discovered on Earth. Instead, it was discovered in 1868 in the form of previously unknown spectral lines in the light of the sun.
v6xj TIL that Dubai has been built by slaves – foreign workers who are lured in on the promise of well-paying jobs, then are stripped of their passports and forced to work for miniscule wages under miserable conditions
x8Ok TIL that 29% of San Francisco’s air pollution comes from China
VM8Yp TIL researchers asked four people to do random acts of kindness for others. Not only did it improve their own mood, but caused those strangers to be kinder to other people too. There is a ripple effect to kindness.