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TIL there's a mineral element (Promethium) so rare that it's estimated there are 500-600 grams of it in the Earth's crust

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Kg7a Today I learned movie trailers used to come after the movie - “trailed” the movie but no one would stay after the film to watch them.
XE98j TIL about Kuchisake-onna, or "Slit-mouthed Woman", who is a vengeful spirit from Japanese folklore that appears as a woman wearing a surgical mask.
oyyA TIL during the Battle of Stalingrad, Soviet losses were so great that at times the life expectancy of a newly arrived soldier was less than a day, and the life expectancy of a Soviet officer was three days. Combat was so fierce, at one point a railway station changed hands 14 times in six hours.
kOQM1 TIL Tennis legend Roger Federer also runs a Children's Education charity in Africa that has created and funded the curriculum for 7,000 schools and 1.5 million students so far
Ome4 TIL that once you become President of the United States of America you can no longer drive on public roads