In his legendary lectures from 1965, Richard P. Feynman succeeded in presenting physics in an easily understandable form without sacrificing accuracy. The didactically skillful structure keeps the reader engaged until the end. Feynman emphasizes the physical ideas, and a comprehensive knowledge of the exact mathematical foundations is not necessary for understanding. Therefore, his books are excellent for both self-study and as a companion to lectures. Volume 4 in the revised New Millennium Edition covers condensed matter.