Impressive in its scale, varies between serious science and humorous storytelling. I filled in a lot of gaps in my knowledge and learned I need to know even more. The chapter on genes and race is a brilliantly made compelling argument with a hidden deeper comparison I only grasped later (I love when that happens): Rutherford first shows how widely diverse his roots are, how tangled and twisted everyone is in general, makes the case for how genes cluster among groups and how they mostly do not (with language syntax transformations etc), and then later on I realized he was also showing how two people of almost the same roots (Galton & Darwin) are so different.