The Tuskegee Syphilis Study (1932–72) left 399 Black men untreated after penicillin became available — a major ethical scandal.
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In 1518, a dancing plague reportedly caused people to dance uncontrollably for days.
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In 1692, the Salem witch trials led to the execution of several individuals in Massachusetts.
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The Year Without a Summer in 1816 followed a massive volcanic eruption in Indonesia.
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The Tulip Mania of the 1600s is considered one of the first economic bubbles.
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The Jurassic period followed the Triassic period.
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The French Revolution began in 1789.
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The Transcontinental Railroad was completed in 1869.
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The Olmec civilization flourished in Mesoamerica.
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