Your middle ear comes from the jawbone of a prehistoric fish. Your skin and hair can be traced to a shrew-like mammal that lived around 195 million years ago. As for your bad back—well, you can thank your primate ancestors for that. It took more than 350 million years for the human body to take its present shape. How did it become the complicated, quirky and amazing machine it is today? Follow this scientific adventure story in Your Inner Fish, based on the best-selling book of the same name by evolutionary biologist Neil Shubin, Ph.D., of the University of Chicago. The film, part of a three-hour series set to air on Wednesdays in April at 10 p.m. ET on PBS, takes us back in time to uncover the amazing history of the human body. Produced by Tangled Bank Studios and Windfall Films for PBS.