The stone spheres of Costa Rica, created by the Diquís culture around 600 AD, were carved to near-perfect roundness.
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The saber-toothed cat went extinct around 10,000 years ago.
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The Cretaceous period ended with a mass extinction event.
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In 1938, a radio broadcast of 'War of the Worlds' caused panic among some listeners.
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The Roman Colosseum could hold tens of thousands of spectators.
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