I found the chapters "Who Are the Left-Handed?" and "Nature or Nurture?" the most interesting. Roth lost me with all the left/right hemisphere talk and all the speculation at the end. The first half is a quick read and I probably should have stopped there. Oh well.
Maybe I've just read too many books on left-handedness, but this one didn't do it for me. There was some new information, but way too much speculation presented as fact, and I got completely bogged down in the section on brain hemispheres.
Interesting cultural and scientific insights.