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
It's still possible to see the division between East and West Germany due to different light bulbs.
5
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
Every year, Alaska has about 5,000 earthquakes.
31
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243