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A chemist mixes a solution and drips fluid into test tubes in 1930. (1930s)
CIRCA 1920s - Scientists devised a way to differentiate human blood from animal blood in the 1920s
CIRCA 1920s - Scientists devised a way to differentiate human blood from animal blood in the 1920s
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CIRCA 1960s - In Japan in 1960, polio struck. The US Forces helped with food and supplies.

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CIRCA 1930s - A chemist mixes a solution and drips fluid into test tubes in 1930.

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