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TIL of a Kugelblitz a theoretical astrophysical object predicted by general relativity. It is a concentration of heat, light or radiation so intense that its energy forms an event horizon and becomes self-trapped. The concentration of energy can warp spacetime so much that it creates a black hole

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GYno1 TIL that 2,000-year-old seeds were discovered in 1963 inside an ancient jar in Israel. They were planted in 2005 and a tree that had been extinct for over 1800 years sprouted.
dvg9 TIL that 70% of Americans either hate their jobs or are completely disengaged from them
bG6a TIL that a NASA astronaut waited 19 years to fly in space. Don Lind was selected in 1966 but was chosen for canceled missions, or as backup for missions; he said, “I was backing up two of the most depressingly healthy people you can imagine.” Lind finally flew on the space shuttle in 1985.
EZOx TIL In 1500s, Mapuche warrior Galvarino had both hands cut off as punishment for defying the Spanish. He returned home, raised an army and fought the Spanish with blades tied to the stubs of his arms.
V8lD TIL that limpets always return to the same bit of rock, and that they grind the rock and their shells away until they form a perfect seal.