The benefits offered by wearable devices seem limitless, and for many people, the devices are really chic. These wireless gadgets can track the number of steps people take each day; measure their heart rates, the number of calories they ate, or the amount of energy they expended; or access data by using cloud computing. Wearables--bracelets, rings, eyeglasses, necklaces, shoe clips, and more--enable individuals to read, text, send e-mails, stay connected via social networks, or access the Internet as they walk. This intriguing volume also explains the devices' cutting-edge medical applications, including as impact indicators for concussion studies.