Body Trivia : Which part of body makes up just 2% of the total body's weight, but uses 20% of its energy?

The brain of an adult human weighs approx. 1.5 kg (3 pounds). 

Although it makes up just 2% of the body's weight, it uses  20% of the total energy.

The human brain is over three times as big as the brain of other mammals that are of similar body size.