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TIL the creation of the Guinness World Records was created by a staff member of Guinness Breweries who wanted a book that could easily be referenced to settle arguments at pubs.

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Yx5r TIL that Irrawaddy dolphins have developed a mutual relationship with local fisherman by chasing fish into their nets in exchange for some leftover fish. This relationship has become so embedded that when a fisherman’s “own” dolphin helped a rival, he followed up with lawsuits.
d8kR8 TIL that Earth has about three TRILLION trees, or about 420 trees per person. There are more trees on earth than there are cells in a human brain or stars in our galaxy.
m1aYo TIL of Operation Plumbbob, where a nuclear bomb was detonated in a vertical tunnel with a 2,000lb (900kg) metal plate plugging the surface. The plate was launched into the air at 6 times Earth's escape velocity
7rVZM TIL after sentencing veteran Green Beret to a night in jail for violating his probation, same judge who is also a vet learned what he was going through after reading his paperwork stayed overnight in the cell with him to be there for him
VBQL0 TIL Serge Voronoff was a surgeon who gained fame for his practice of xenotransplantation of monkey testicle tissues onto the testicles of men as anti-aging therapy while working in France in the 1920s and 1930s.