The average stay for a prisoner on Alcatraz, when it was used as a prison, was five years.

The world's largest book, "Bhutan: A Visual Odyssey" is in a Chicago public library. The book measures 5 feet tall by 7 feet wide when open. It weighs 133 pounds.

Even today, 90% of the continental United States is still open space or farmland.

AMAZING FACTS