An introduction to sound that explains what sound is, how it travels in waves, how scientists measure the speed of sound, and how music is made and heard.
Examines how electricity is produced and outlines the ways it can be used, from powering appliances to making objects stick together. Contains instructions for simple activities and includes full-color photographs, a glossary, and further reading sources.
An introduction to magnetism that explains what it is, what materials are magnetic, how magnets work, what magnetic poles are, and what the different types of magnets are.
