In the movie "WaterWorld," Kevin Costner's character has a mutation that gives him gills behind the ears. Could a mutation allow people to swim in the water just like fish --without having to use any sort of scuba equipment?
WHAT'S INSIDE: HUMAN BODY
- Body Parts
- Body Systems
It happens more often than you may think. Sometimes a baby is born with organs outside of his or her body and has a slim chance of survival. What causes this?
Does the appendix serve any purpose in the human body? Scientists are divided on the issue -- learn why.