A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
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.
14
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
More than 25% of the world's forests are in Siberia.
51