10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
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 'King Ranch' in Texas is bigger than the state of Rhode Island.
49
The state with the longest coastline in the Continental U.S. is Michigan.
31
Every year, Alaska has about 5,000 earthquakes.
31