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TIL that satellites in geosynchronous orbit generally retain a spacing of at least 73 km's from one another.

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E1EAX TIL tears contain leucine enkephalin, a natural pain killer, which is suggested to be the mechanism behind the experience of crying from emotion making an individual feel better.
WkB1X TIL velcro was invented by a Swiss electrical engineer after a hunting trip in the Alps in 1941. He took a close look at the burrs of burdock that stuck to his clothes and his dog’s fur and developed the technology for commercial use in the 1950s.
Me9jW TIL of Mark Hoffmann, a notorious forger, noted for creating historical records pertaining to the Latter Day Saints (Mormonism). As his forgeries contained details that contradicted official teachings, church officials often purchased them to prevent their release.
WkLdo TIL when John Connally died in 1993, there was a petition to recover the fragments of the bullet that hit him in Kennedy's assassination, hoping to disprove the single bullet theory. Department of justice replied that it would approve if Connally's family gave permission, which they refused to give.
6ENR8 Fiber lasers mean ray guns are coming.