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It's very well-written and digestible, but the ideas are just so thin. There isn't a lot of there there. I mean, there are discussions of some interesting studies and some interesting conclusions and interpretations, but really, there is not enough in here for a book. The authors say that the book idea grew out of a magazine piece, and that's exactly what it felt like, a beefed up article.
It's a shame, because I had high hopes for it. I read it in two days, which is very satisfying for me given how little I've been reading lately. But ultimately it was very disappointing.