The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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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
One cubic mile of seawater contains about 50 pounds of gold.
79
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).
25
The water between India and Sri Lanka is only 3-30 feet deep and was purportedly passable on foot until 1480 AD when a cyclone moved some sand around.
1
Even Antarctica has an area code. It's 672.
58
In 1850, only 8% of the people in California were women.
0
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62