Why should we appreciate our nervous system? Read these 11 fun facts and you’ll know why: 1. The body has billions of nerve cells Every person’s body contains billions of nerve cells (neurons).

Here are 12 fascinating facts about your immune system. It saves lives. The immune system is a complex network of tissues and organs that spreads throughout the entire body. In a nutshell ...

What do you know about the endocrine system? In school, we learned that hormones and the glands that produce them comprise ...