The Manhattan Project involved thousands of scientists working in secrecy.
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The Pentagon Papers revealed previously undisclosed details about U.S. involvement in Vietnam.
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Ancient Greece made contributions to mathematics and philosophy.
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In 1978, thousands of people gathered to watch a man attempt to fly using homemade wings.
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Early humans hunted megafauna during the Ice Age.
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In 1961, Yuri Gagarin became the first human in space.
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In 2001, a Norwegian man survived a fall through ice by floating in near-freezing water.
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The Great London Beer Flood of 1814 released thousands of gallons of beer into the streets.
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The Vikings explored parts of North America centuries before Columbus.
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