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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It's still possible to see the division between East and West Germany due to different light bulbs.
5
The Niagara Falls moves upstream at an average rate of about 295ft a century!
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Check your map! Virginia extends farther west than West Virginia.
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Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
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The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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