An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
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If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
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In 1850, only 8% of the people in California were women.
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There are more than 50,000 earthquakes throughout the world every year!
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