The CIA declassified documents regarding covert Cold War activities in the 1990s.
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The Permian extinction eliminated most marine species.
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The Roswell incident sparked decades of extraterrestrial speculation.
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In 1947, the Roswell incident sparked decades of speculation about extraterrestrial life.
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The Mongol Empire became the largest contiguous land empire in history.
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The Inca built extensive road networks across the Andes.
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The Industrial Revolution began in the 18th century.
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The eruption of Krakatoa in 1883 was heard thousands of miles away.
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The Tuskegee Syphilis Study withheld treatment from participants for decades.
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