Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
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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
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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It's still possible to see the division between East and West Germany due to different light bulbs.
5
The state with the longest coastline in the Continental U.S. is Michigan.
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There are more than 50,000 earthquakes throughout the world every year!
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The city of Houston, Texas is built on a swamp and is slowly sinking!
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