If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
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
It's still possible to see the division between East and West Germany due to different light bulbs.
5
The Atlantic Ocean is saltier than the Pacific Ocean.
54
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
The Caspian Sea is also classed as the world's largest lake.
52
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
56