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TIL natural nuclear fission reactors were discovered in Gabon, Africa. They operated for a few hundred thousand years and generated an average of 100kW of power.

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jbNa TIL that in 1997, 14 year old Nathan Zohner was able to get 43 out of 50 of his classmates to vote to ban “Dihydrogen Monoxide” for his science fair project. His project aimed to prove that the use of true facts can lead the ignorant public to false conclusions. He won first prize.
wmL8 TIL The Foo Fighters promoted AIDS Denialism and Have Not Since Recanted
R5pg1 TIL that the writer of the Mexican National Anthem, a love poet, didn't think he'd be able to write such a thing for an on-going national anthem competition. His fiancée frustrated, then lured and locked him into her parent's bedroom, until he slid out a piece of paper after four hours.
Mwkm TIL Restaurants can sing ‘Happy Birthday’ now because the copyrights claims are now invalid.
D16We TIL the Peace Symbol represents the flag semaphores for ‘N’ (flags held at 5 and 7o’clock positions) and ‘D’ (flags held at 12 and 6o’clock) and stands for Nuclear Disarmament.