Six Not-so-easy Pieces Link

Reviews of the book consistently highlight the "not-so-easy" nature of its content compared to the first volume:

: This central portion explains how the flow of time and mass change with velocity, and why the speed of light remains constant for all observers. Six Not-So-Easy Pieces

: The opening lectures explore the role of symmetry in physical laws and provide a necessary primer on vector analysis. Reviews of the book consistently highlight the "not-so-easy"

: Some readers find the difficulty spikes unevenly. For instance, the chapters on vectors are relatively standard, but topics like muons and quarks can feel introduced with little context. Six Not-So-Easy Pieces