10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
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 Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
It's still possible to see the division between East and West Germany due to different light bulbs.
5
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
Australia's Great Barrier Reef is 1,250 miles long!
45
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55