The Universe Within is a scientific book written by Neil Shubin, who is also the author of your inner fish, that talks about very interesting things about the universe. The Universe Within explains how the universe was formed and discovered billions of years ago. It also tells you the history of rocks, plants, and humans. Neil Shubin is a science writer, paleontologist, and an evolutionary biologist. Since Shubin is a paleontologist he knows a lot about rocks and fossils. He knows how old they are, what type they are, etc. Shubin explains in the book about a small tiny tooth fossil, that came from a extinct animal, that has a similar tooth to humans. In the book Shubin talks about how an adventure he went with a group of college friends