Throughout the world, injuries are the leading cause of death for young adults, adolescents, and children. Injury death and hospitalization are also high among the elderly. With the improved prevention and treatment of infectious and degenerative diseases, the importance of injuries as a debilitating factor has rapidly increased around the world. Better living conditions have decreased the number of some types of injuries--such as drownings and burns--but the proliferation of new, high-energy vehicles, machinery, and weapons has offset this trend by significantly increasing the number of...