Epstein explores complex genetic questions that reach far beyond sports in a way that is both understandable and entertaining. He somehow figures out a way to make scientific reading for the layperson feel comfortable. Through most of the book, the reader feels almost as if Epstein is sitting in the same room answering questions as he astutely anticipates your confusion and breaks it down with clarity and confidence. Maybe most importantly though, he finally takes on the 10,000 hour expertise theory popularized by Malcolm Gladwell with solid evidence and conviction. But away from the science, it's just a must read for sports fans. The questions I have had my whole life playing sports are explored in a way that is engaging and witty. His stories conjure up vivid images for the reader while tracing a pretty consistent narrative in a book that could easily otherwise be all over the place. If you follow Epstein's columns in Sports Illustrated, you won't be able to put this one down.