Kenna Hughes-Castleberry is the Content Manager at Space.com. Formerly, she was the Science Communicator at JILA, a physics ...

Your heart pumps blood from your head to your toes, provides cells with fresh oxygen, and removes waste products. Located in the middle of your chest and tilted slightly to the left, your heart pushes ...

The human skeleton — our internal framework that includes bones and cartilage — evolved over millions of years. It comprises an axial skeleton, which consists of the skull and the spine, as well as an ...