If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
56
The state with the longest coastline in the Continental U.S. is Michigan.
31
Israel's Dead Sea is 1,312 feet below sea level.
48
The Caspian Sea is also classed as the world's largest lake.
52
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Mexico City is built on top of an underground resevoir!
47