There are approximately three chickens for every human on Earth.
13
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
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
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).
25
The Amazon rainforest produces more than 20% the world's oxygen supply.
182