Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
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In 1850, only 8% of the people in California were women.
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The city of Houston, Texas is built on a swamp and is slowly sinking!
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The Niagara Falls moves upstream at an average rate of about 295ft a century!
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Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
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The Sahara desert expands at about 1km per month.
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An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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