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TIL about Lepersonnite, an extremely rare rare earth mineral only found in Shinkolobwe deposit in the Democratic Republic of the Congo. It is the only mineral in which the chemical element Gadolinium, otherwise too reactive to exist, is found in nature. 400 tonnes of Gadolinium are produced yearly.

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Bwmd TIL Milton Hershey being unable to have children founded the Milton Hershey School for orphans in 1909. He donated 30% of all future Hershey profits. It now has 7 billion in assets, and continues to serve orphans in financial need. Milton also prohibited it’s use in any advertising.
womR1 TIL In a single battle in a single day, one-quarter of the entire United States Army had been destroyed. It was the most decisive defeat in American history with 69% of soldiers killed and 97% casualties. It's known as St Clair's defeat and Major General St Clair resigned his commission afterwards.
MkYV TIL that the voice of Optimus Prime, Peter Cullen, also voiced Eeyore.
MoZV TIL 10-18 million Africans were taken by Arab slavers. This is more than the 12 million Africans shipped in the Atlantic slave trade, and 16-30 times more than the 600,000 slaves imported to America since 1620, which is less than the more than 1 million whites enslaved by Ottoman vassals.
9Wy6 TIL in 1955 there was no federal statute that made it a crime to blow up a plane. So the bomber of Flight 629, Jack Graham, was charged with a single count of murdering his mother. All passengers and crew (44) were killed.