The Boston Marathon is the world's oldest annual marathon, first held in 1897.
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Project MK-Ultra was a CIA program that conducted experiments on mind control techniques.
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The Persian Empire built an extensive network of roads.
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The Olmec civilization flourished in Mesoamerica.
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The Chicxulub crater is linked to the dinosaur extinction event.
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The Mongol Empire became the largest contiguous land empire in history.
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The Trojan War is part of ancient Greek legend.
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In 1865, a volcanic eruption in Indonesia affected global weather patterns.
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Prehistoric cave paintings provide insight into early humans.
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