You’re pretty special. On this planet, it’s rare to have bones. Only two percent of the animal species living on Earth have an internal skeleton. The rest of the living creatures here are invertebrates like insects, shellfish, and arachnids. But you have 206 bones inside your body making up this important structural component. Your hands and your feet contain more than half of the bones in your body—in two hands and two feet alone, there are 106 bones. How do you take care of this important body system?