The ancient Greek theatres were designed with such precision that actors could be heard clearly by 15,000 spectators.
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The Roswell incident sparked decades of extraterrestrial speculation.
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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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Prehistoric climates were often warmer than today.
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The United Nations was founded in 1945.
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In 1979, a computer error nearly triggered a false nuclear alarm in the United States.
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The Chicxulub crater is linked to the dinosaur extinction event.
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