Ancient Romans built extensive road networks across Europe.
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The Tuskegee Syphilis Study withheld treatment from participants for decades.
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The eruption of Krakatoa in 1883 was heard thousands of miles away.
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The Permian extinction eliminated most marine species.
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In 2008, a Norwegian town experienced a strange spiral light in the sky caused by a missile test.
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In 1518, a dancing plague reportedly caused people in Strasbourg to dance uncontrollably for days.
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In 1814, a beer flood in London released thousands of gallons into nearby streets.
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Project MK-Ultra was a CIA program that conducted experiments on mind control techniques.
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The Great London Beer Flood of 1814 released thousands of gallons of beer into the streets.
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