Extra body parts can occur more often than people might think. Doctors call the extra appendages "supernumerary" body parts and these can be found on some famous people in history.
WHAT'S INSIDE: HUMAN BODY
- Body Parts
- Body Systems
Millions of people have refractive vision problems -- when the eyes get blurry or can't focus on an object. Learn about four major types of refractive vision problems.
The human body is an incredible machine. Take a look at the anatomy and physiology at play in your bones, skin and everything in between.