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TIL of The mangrove killifish, a type of fish that live in trees. They’re also hermaphrodites capable of producing offspring alone.

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dD4W9 TIL Basic oxygen steelmaking was invented by just one man; the Swiss engineer Robert Durrer in 1948. Durrer's technique accounts for 60% of all steel production as of 2000. additionally, since 1920 the labor requirements to produce steel have decreased by a factor of 1,000.
keWg TIL that plankton perform 45% of Earth’s photosynthesis, yet are less than 1% of its total plant mass.
Z1a TIL that John Smith, before Jamestown, was a trader, pirate, slave, mercenary, knight and had won three duels. He had been to (at least) modern day Romania, Hungary, Turkey, Ukraine, Russia, Poland, Spain, North Africa, England and the Americas all by the age of 27.
OoDL7 TIL when the "Red Baron" was shot down and killed in combat, his enemies buried him with full military honors and a wreath that said: "To Our Gallant and Worthy Foe"
0101 TIL that the dentist who pioneered the use of laughing gas became addicted to chloroform, threw sulfuric acid over two prostitutes, was sent to prison, and committed suicide with his shaving razor