A hummingbird weighs less than a penny.
You burn 26 calories in a one minute kiss.
Most elephants weigh less than a blue whale's tongue.
By weight, Bone is five times stronger than steel.
You burn more calories sleeping than you do watching television.
The elephant brain weighs about 6,000g.
The Main Library at Indiana University sinks over an inch every year because when it was built, engineers failed to take into account the weight of all the books that would occupy the building.