Feynman, Richard P. Six not-so-easy pieces : Einstein's relativity, symmetry, and space-time / Richard P. Feynman - India Penguin Books 2011 - 151 p. ISBN: 9780140276671 Subjects--Topical Terms: Space and time.Special relativity (Physics) ᅠSymmetry (Physics) ᅠ Dewey Class. No.: 530.11 FEY-R