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TIL the Civilian Conservation Corps (CCC) was founded by FDR's New Deal in 1933. In its 9 year existence the CCC employed nearly 3 million men, planted over 3.5 billion trees, and established more than 700 state parks. It was the most rapid peacetime mobilization in US history.

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5Vo5P TIL scientists didn’t use real blood to test absorbency of menstrual products, such as pads, until 2023. Up until then, a saline solution was the default method.
xYwD TIL the gold discovery in California that led to the Gold Rush happened in January 1848. The miners were ‘49ers and not '48ers because it took so long for the news to spread widely.
BgaVr TIL that Japanese had a branch of Unit 731 in Singapore during WW2 that manufactured bio weapons
YpPeA TIL that to get the perfectly high-pitched voices of the chipmunks in the Alvin and the Chipmunks series, the voice actors would speak very slowly into a tape recorder, which would then be sped up to normal talking speeds.
kOeRg TIL that MTV refused to play "Billie Jean" and had never played any other video by Jackson or a black artist. Only after CBS Records president threatened to pull every video clip from his company and expose the racial discrimination MTV relented.