3.5 / I liked the way Nestor approached the subject, combining contemporary science with older and differently rooted disciplines - and keeping a very open mind through it all. In the end I was a bit underwhelmed by his circling around the same thing, which was no doubt his experience throughout all he'd seen during his ten year period of research. The way he structured his narrative was very obvious, and therefore a bit too simplistic or too easy. Yet, even when I am no big fan of popular american non-fiction, I'm not hesitant to say that this one was worth the read.