How did the human body become the complicated, quirky and amazing machine it is today? This cutting-edge scientific adventure reveals a startling truth: hidden within the human body is a story of life on Earth, and the legacy of animals that lived hundreds of millions of years ago. Based on the best-selling book by Neil Shubin, the series travels from Africa to the Arctic Circle to uncover the 3.5 billion year history of the human body — and how a colorful cast of ancient characters made us who we are today.