In the 1930s, a mistake that cost over a hundred lives helped usher in a new era of safer medicine.

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Sources:
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https://www.the-scientist.com/?articl...
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https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...