One cubic mile of seawater contains about 50 pounds of gold.
79
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
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
56
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).
25
The city of Houston, Texas is built on a swamp and is slowly sinking!
89