Sound provides and offers amazing insights into the world. Sound waves may be defined as mechanical energy that moves through air or other medium as a longitudinal wave and consists of pressure fluctuations. Humans and animals alike use sound as a means of communication and a tool for survival. Mammals, such as bats, use ultrasonic sound waves to detect and capture insects for food while flying in the air. Whales and dolphins use echolocation as a means to navigate in the rivers and oceans. Humans use the properties of sound for communication, entertainment, and to do useful work. Sound and speech are significant factors that differentiate humans from other animals. Sound and ultrasonics are used extensively in business, industry, medical professions, and civilian sectors as tools to measure, clean, and machine materials. Additionally, sound technologies, such as sonar, may be used for mapping and navigation of rivers and oceans. Robots may use ultrasonic technologies for navigation, guidance, and avoidance strategies. Several basic principles about the properties of sound enable everyone to use mathematical relationships to measure distance by using the speed of sound versus time. Sound is truly amazing. (Contains 2 tables and 6 figures.)