An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
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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 Amazon rainforest produces more than 20% the world's oxygen supply.
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In 1850, only 8% of the people in California were women.
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Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
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