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
Mexico City is built on top of an underground resevoir!
47
Europe is the only continent without a desert.
62
Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
The Amazon rainforest produces more than 20% the world's oxygen supply.
182