If Manhattan had the same population density as Alaska, there would only be 15 people living there.
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
The North Atlantic gets 2.5 centimetres (1in) wider every year.
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).