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.
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The state with the longest coastline in the Continental U.S. is Michigan.
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The Niagara Falls moves upstream at an average rate of about 295ft a century!
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Mexico City is built on top of an underground resevoir!
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Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
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The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
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The Caspian Sea is also classed as the world's largest lake.
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