Scientists and clinicians who want to broaden their understanding of the musculoskeletal system should read this book, whether their patients are top-placed marathon runners or persons for whom taking ten steps out of bed is a marathon. As a society, we are very accustomed to the visible functions of muscle, fat, bone, and connective tissue. We frequently refer to the musculoskeletal system when describing a person — frail, strong, brittle-boned, big, lean, short, agile, muscular, skinny, fit, and so on. Minutes after a child’s birth we proudly announce those two key musculoskeletal parameters of height and weight.