Book excerpt: Human Bones combines an intriguing discussion of the function and design of human bones with stunningly beautiful color photographs that capture their unique elegance. R. McNeill Alexander, the world's foremost authority on biomechanics, takes the reader on a tour of the human skeleton, investigating and celebrating the human body's 213 bones. Alexander explores the nature of human bones as well as their relationship with other parts of the body in this lucid and informative book. Beginning by reminding readers that bones are living organs-they grow, suffer damage, and repair themselves just like other organs-Alexander elucidates the form and function of the myriad bones in the skull, the arms and legs, and the torso. How the bones in the arm combine with the torso at the shoulder to create a wide range of motion, and the relationship among the various parts of the skull-the nose and mouth cavities, for example-are some of the topics explored. Counterintuitive insights are revealed along the way with the help of do-it-yourself interactive experiments that prompt readers to investigate their own bodies. Why different people's bones are different is examined in detail by Alexander. This knowledge is behind important work in forensic science and archaeology: it informs the art behind the reconstruction of faces from skulls, and the composition of bones betrays information about the lives of individuals and their daily habits. Throughout the work Alexander places bones in their ancestral context, explaining the principles of evolution and how these relate to utility, and he devotes an entire chapter to exploring the evolutionary relationship between human bones and those of other mammals. Alexander's authoritative, crystalline prose, Diskin's 115 color photographs, and superb graphic design have united in this remarkable book to showcase the extraordinary beauty at the core of our bodies.