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.

It wasn't until the 16th century that most mathematical symbols were invented. Before this time math equations were written in words, making it very time consuming.

A cubic mile of fog is made up of less than a gallon of water.

AMAZING FACTS