The ancient Maya accurately tracked Venus's 584-day cycle and synchronized it with their sacred calendar.
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The Ice Age allowed humans to migrate across land bridges.
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In 1896, two countries fought a war that lasted under 45 minutes.
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In 1947, the Roswell incident sparked decades of speculation about extraterrestrial life.
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The eruption of Krakatoa in 1883 was heard thousands of miles away.
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The Chicxulub crater is linked to the dinosaur extinction event.
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The Boston Marathon is one of the oldest annual marathons.
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The woolly mammoth lived during the last Ice Age.
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The Year Without a Summer in 1816 followed a massive volcanic eruption in Indonesia.
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