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TIL the United States Postal Service is the single largest employer of veterans (22% of the postal workforce) and nearly a third of the veterans are disabled.

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nAJr TIL the human brain remains half awake when sleeping in a new environment for the first time.
D8Qg TIL - Childhood lead poisoning was linked to lead-based paints in 1904. Several EU countries banned it in 1909, League of Nations banned it in 1922. The US did not start phasing it out until 1971 & houses built before 1978 may contain lead paint
4eAJ TIL that when males are cured of ebola virus, they can still transmit the virus in their semen for up to 2 months because it can survive in the testicles away from the immune system
mxYBy TIL of a 1930s Welsh medium who claimed to be able to levitate during seances performed in complete darkness with help from spirits. People began to demand their money back from him after learning he was simply jumping up in the air.
JeYl TIL that the collective noun for a group of flamingos is a flamboyance; for butterflies, a kaleidoscope.