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TIL Saturn rings disappear every few years

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9YA9p TIL of Hannah Senesh, a Jewish paratrooper and poet during the Holocaust. She was captured, tortured, and eventually executed, but never gave up her comrades. "I could have been twenty-three next July; I gambled on what mattered most, the dice were cast. I lost."
N7RaP TIL that many birds do not breed very well in small flocks and that Zoos use mirrors to help increase reproduction.
WpJ4 TIL that at age 9, Ron McNair, the African-American astronaut later killed in the Challenger explosion in 1986, refused to leave a segregated public library after the librarian rejected his request to check out some books. The police were called, as was his mother.
kO17 TIL Heineken bottles used to be shaped like bricks so you could build houses out of them.
nWJ6W TIL dandelion roots can be made into a coffee-like beverage.