My favorite part of those books is Book II, Chapter 19 on "The Principle of Least Action" - a great explanation of the core of what he would win his Nobel prize

My favorite part of those books is Book II, Chapter 19 on "The Principle of Least Action" - a great explanation of the core of what he would win his Nobel prize for two years later. The sizable section that analyzes ways to try "beat" the two-slit electron experiment is also amazing.