The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).
25
The state of Florida is bigger than England!
74
In 1850, only 8% of the people in California were women.
0
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
The Amazon rainforest produces more than 20% the world's oxygen supply.
182