In 1850, only 8% of the people in California were women.
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Every year, Alaska has about 5,000 earthquakes.
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An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
Even Antarctica has an area code. It's 672.
58
The Niagara Falls moves upstream at an average rate of about 295ft a century!
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The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
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The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17