An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
The Atlantic Ocean is saltier than the Pacific Ocean.
54