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
Israel's Dead Sea is 1,312 feet below sea level.
48
The Caspian Sea is also classed as the world's largest lake.
52
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
There are approximately three chickens for every human on Earth.
13
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
More than 25% of the world's forests are in Siberia.
51
Europe is the only continent without a desert.
62