New addition to the What Everyone Should Know series, this is really a book for adult education sections in Public Libraries and for young people with some background in physics. The historical introduction -- somewhat glib --reaches back to the earliest recorded experiments on static electricity, and forward to modern times. With the work of Fleming and DeForest the authors pick up the main body. The actual exposition of electronic theory and its applications in radio, television, radar and industrial processes is a good lucid job of popularization. If the illustrations indicated in the galleys are all, they are too few to do justice to a relatively difficult subject.