1.

The strongest muscle in the human body is the tongue in proportion to it's size.

2.

In a human body, 25% of the bones are located in the feet.

3.

The hardest tissue in the human body is the tooth enamel.

4.

Second to bone marrow, hair is the fastest growing tissue in the human body.

5.

All of the bacteria in the human body collectively weighs about 4 pounds.