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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Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
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Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
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The Amazon rainforest produces more than 20% the world's oxygen supply.
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Europe is the only continent without a desert.
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Forest growth in the US has exceeded harvest since the 1940’s. Today, we have more trees than any time in the past 100 years.
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The Caspian Sea is also classed as the world's largest lake.
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The Niagara Falls moves upstream at an average rate of about 295ft a century!
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