Chapter 4 on Richard Feynman, my theoretical physics thesis advisor, is a collection of vignettes that reveal aspects of behavior and thought that contributed to his mystique and unique accomplishments in physics.

After relating the history behind Feynman’s V-A theory of party violation, much of it in Feynman’s own words, the rest of the chapter is based on my personal interactions with Feynman lasting for a little more than twenty years, from the time I arrived at Caltech in 1959 till I left in 1981. Feynman’s attitude towards experimental results related to parity violation provides an informative background to how he would handle experimental information related to the discovery of quarks. The intent here, and in the remainder of the Chapter, is to give the reader a sense of how Feynman thought about physics, how he practiced it, and what he valued. His struggle with constituent quarks (aces), and what to make of them, lasted considerably longer than a decade, passing though several phases, including one with partons, but eventually ending with his fully accepting their reality.

There are many representations of time reversal symmetry, including PT, CT, and CPT, but only the standard time reversal operator T is associated with an arrow of time itself.