This is the third volume (370 pages) of the Motion Mountain physics text: it introduces electricity, magnetism, optics and the human brain.
It provides a simple, modern and surprising overview, with many figures and photographs. The text, printed in black and white, is written in an easy style, uses little mathematics, and is accessible to undergraduates, teachers and anybody who is interested in the precise description of nature. The colour pdf, with all the embedded films, can be downloaded for free at the www.motionmountain.net website. Enjoy the reading!