Book excerpt: Written to save careers one voice at a time through scientifically proven methods and advice, this resource teaches people how to protect and improve one of their most valuable assets: their speaking voice. Simple explanations of vocal anatomy and up-to-date instruction for vocal injury prevention are accompanied by illustrations, photographs, and FAQs. An audio CD of easy-to-follow vocal-strengthening exercises--including Hum and Chew, Puppy Dog Whimper, Sirens, Lip Trills, and Tongue Twisters--is also included, along with information on breathing basics, vocal-cord vibration, and working with students who have medical complications such as asthma, acid reflux, or anxiety.