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TIL: In 1990s, some Chinese villages grew economically by widespread selling of blood, leading to many HIV deaths

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VBwdm TIL about Seligmannite, a rare metallic mineral named in honor of Gustav Seligmann who was a mineral collector, amateur crystallographer, author, and banker.
VB5Wm TIL there is a World Championship for Microsoft Excel.
m1Zbv TIL that Benjamin Franklin wrote a joke paper submission to the Royal Academy of Brussels called "Fart Proudly" which details how important research into reducing the smell of farts needs to be undertaken.
1lnX TIL: No expert can verify the origins of Friday the 13th. But the first written references to its wickedness appear around the mid-19th century when William Fowler, a U.S. Army captain, founded the Thirteen Club — a group of 13 men in Manhattan devoted to proving the superstitions were false.
Oorne TIL: Researchers taught African grey parrots to buy food using tokens. They were then paired up, one parrot given ten tokens and the other none. Without any incentive for sharing, parrots with tokens started to give some to their broke partners so that everyone could eat.