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TIL of a device called the Salmon Cannon that uses a pressure differential to suck up a fish, send it through a tube at up to 22 mph, and then shoot it out the other side. This allows the fish to bypass dams and get upstream to spawn.

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YpXJP TIL: Astronaut groupies in Florida were nicknamed "Cape Cookies". Infidelity was rife; wives had to maintain a perfect facade. Only 7/30 astro-marriages in the 60s survived. Alan Shepherd (first american in space), Pete Conrad (3rd man on the moon) and Dick Gordon (Apollo 12) formed the Go-Go crew.
oB9VE TIL Anne Frank’s dad edited her diary, removing things about sex and dirty jokes.
BrkGk TIL that in 1997, Julie Rea Harper scuffled with a man in her home who had broken in and killed her son. She was initially tried and convicted of the murder, but after a later apprehension, serial killer Tommy Lynn Sells admitted to Harper's account and his guilt, resulting in Harper's exoneration.
AEDg TIL Elmer McCurdy was mummified and used as a stage prop for 26 years before people realized his corpse was a real body
Yp9XA Japanese mountaineer Junko Tabei, the first woman to summit Mount Everest, created her own climbing equipment from scratch out of old curtains and the cover of her car.