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TIL Common Smoke detectors in Russia use weapons grade Plutonium-239 for the source.

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0w8nM TIL about Ralph Lazo, a Mexican-American who voluntarily relocated to a World War II Japanese American internment camp (Manzanar) to join his Japanese-American friends and neighbors. He was the only known non-spouse, non-Japanese American at Manzanar, where he lived for 2.5 years.
J1y41 TIL That back in 1739, measurements of the Earth were made that were so accurate, modern measurements of the circumference only differ by less than 8km. 40,000km -> 40,007.863km
5Y55n TIL if the Queen of England moves her purse from her right arm to her left that a signal for her staff to come interrupt her conversation.
ZXma TIL radar guns don’t work in the rain so unless a cop is pacing you by driving behind you, the odds are virtually zero that you will get pulled for speeding in the rain.
aB7b TIL that three of the actors who played Nazis on the WWII sitcom “Hogan’s Heroes” were German Jews who had escaped from Nazi Germany. Two of them spent time in concentration camps, and another French Jewish actor also spent time in a camp.