Behold the cynodont. (Sounds like: sign-uh-daunt.) Cynodonts gave rise to all living mammals about 250 million years ago. Or so. These...

This video from 1987 is fun to watch just to see how Jon Zahourek thinks—and observes. In less than a minute, he covers so much ground....

Before the fish was the tunicate—the marine invertebrate. The inner layer of the tunicate is a tube that moves water (and nutrients) in...

Keep moving! Good blood circulation is vital to health. And movement helps move blood. The heart gets a lot of the credit for...

No matter how far you go back in the history of human evolution—actually, in the history of all living organisms on planet Earth—there...

One thing Jon Zahourek routinely emphasizes is that a model of human anatomy is always close at hand. Yourself. It’s always there as a...