This product is a viewing guide for the Sound episode of a PBS production called How We Got to Now. This great 55 min video explores the background science, inventors and many inventions that shaped existing sound technologies such as music recording, electric guitars, the radio, sonar and several other applications. It is a very engaging and relatable program and my 7th-grade students loved it! Most of the content was easy to understand after we have completed our unit on sound waves, howeve