The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
The state with the longest coastline in the Continental U.S. is Michigan.
31
More than 25% of the world's forests are in Siberia.
51
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
The names of the continents all end with the same letter with which they start, excluding the North and South infront of AmericA.
86
Mexico City is built on top of an underground resevoir!
47