Ancient Greek mathematician Eratosthenes calculated the Earth's circumference with remarkable accuracy around 240 BC.
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In 1919, the Boston Police Strike left the city without law enforcement for days.
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The Inca built extensive road networks across the Andes.
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In 1896, two countries fought a war that lasted under 45 minutes.
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In 1876, a town in Kentucky reported strange lights in the sky later attributed to natural causes.
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The Tang Dynasty is known for cultural achievements in China.
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The 2010 Eyjafjallajökull eruption disrupted European air travel.
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