Take the skin quiz:

1. What is the largest organ in the human body and the only one exposed to the outside world? The skin.

2. Why do we sweat? To keep cool.

3. What part of the body has the most sensive skin? The Lips.

More fun facts about the skin:

• Skin grows faster than any other organ. We keep renewing it our whole lives.

• Skin's biggest job is protection. It is a tough, flexible, and waterproof covering that protects other organs and body parts from germs, heat, cold, and sunlight.

• Nerve cells in the skin make it sensitve to touch pressure, and temperature.