FEYNMAN, RICHARD P. — Six Not-So-Easy Pieces. Einstein's Relativity, Symmetry and Space-Time.

London: Allen Lane. The Penguin Press, 1998. Though slightly more challenging than the first 'Six Easy Pieces', these rewarding lectures are more focused, delving into the most revolutionary discovery of twentieth-century physics: Einstein's theory of relativity." Pp.xxvi/150. Black boards, dustwrapper. VG/VG.