"According to the World Health Organization (WHO), more than 5 percent of the world's population has disabling hearing loss. Some people's hearing loss is mild. They can communicate through spoken language and may use a hearing aid. Some people have profound hearing loss, which most people refer to as being deaf. In this book, readers will learn the causes of deafness and the different ways in which deaf people communicate. Full-color photographs and age-appropriate text help readers understand this common condition"-- Provided by publisher.