The human body is an amazing structure made up of many fascinating parts and systems. Learn about the human body and how its systems work together.
Your appendix is really a pretty mysterious organ. Find out why you have an organ that's not necessary to your survival.
Your ears are very sensitive to the air or water pressure around them. But just what happens when you dive into that pool?
The heart is a vital organ that basically serves as a pump. Learn about heart chambers and valves, blood flow, the heart's electrical system and blood supply. Read more about how this amazing organ works.
There are millions of bacteria, microbes, viruses, toxins and parasites that want to invade your body. And they'd happily do it, too -- if it weren't for your immune system.