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Til The letters of last resort are 4 identically worded handwritten letters from the prime minister of the UK to the commanding officers of the 4 British ballistic missile submarines. They contain orders on what action to take if an enemy nuclear strike has destroyed the British government.

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9Gmm TIL the only Western academic degree displayed by North Korean leader Kim Il-Sung in his official residence, the Kumsusan Palace of the Sun, was a doctorate degree from Kensington University, a “distance learning” diploma mill shut down in 2003 by a court order
p8pb4 TIL that James Buchanan, the 15th President of the United States, is the only president to have military experience without having been an officer. He was a private in the Pennsylvania militia in 1814.
5V7Qk TIL there's a whole gum wall in Seattle and 2,350 lbs (1,070 kg) of gum was removed in 2015!
VBBJ0 TIL about greek mythological figure Biston, son of Ares. He is considered to have introduced the Thracian practice of tattooing both men and women with eye-like symbols as a magical fetish which was said to be ensuring victory against their neighbouring tribes according to the oracle.
e06PL TIL a space shuttle’s main engine is 99.9% efficient, meaning that almost all of its hydrogen and oxygen is used to create thrust. By comparison, an automobile engine is only about 30% efficient.