A lot slower than Sacks' other books (with the possible exception of "Island of the Colorblind" where he goes off on tangents about ferns). This book DOES have a lot of insight into the kind of person that Sacks is, and why he thinks the way he does, but if you're interested in STORIES, I would recommend "The Man Who Mistook his Wife for a Hat" or "An Anthropoligist on Mars."