The rat has been called the world’s most destructive mammal - other than man. See more

Rats destroy an estimated 1/3 of the world’s food supply each year. See more

Each card in a deck represents a king from history: Spades- King David, Hearts- Charlemagne, Clubs-Alexander the Great, Diamonds- Julius Caesar See more

Coca-Cola used to contain cocaine when it was initially introduced. See more

Acorns were used as a coffee substitute during the American Civil War. See more

Chocolate was used as medicine during the 18th century. It was believed that chocolate could cure a stomach ache. See more

Consuming chocolate was once considered a sin during the 16th and 17th century. See more

The only "real" food that U.S. Astronauts are allowed to take into space is pecan nuts. See more

During warm weather hippopotamus's secrete sweat that is pink. This substance not only cools them down but also helps fight infections of the skin. See more