This book provides a high-level summary of societal norms to which many of us have grown accustomed, but some of us may still not understand. Much of it seemed like filler to me, although it could be useful to someone with autism or a similar social handicap.
I did, however, take away two pieces of knowledge regarding women in the workplace. The first was the business vs. social gaze. I am more mindful of it now, as I tend to look at a person's entire face when they're talking to me. The book suggests you direct your attention to the person's forehead rather than their lips. Looking at one's lips in a subconsciously flirtatious move that could have disastrous results in the wrong setting. (That explains so much!)
The second was the feminine head tilt. I know I do this in pictures, and now I'm trying to be more aware of it when I'm talking to coworkers. Again, it's considered a signal of flirtation, and it should be avoided. Hooray for being aware of one's own body!
I also didn't know that when you nod your head at least three times while someone is talking, the person will talk three to four times more than usual. That might be a fun experiment to try. The book was peppered with several others, but some of them were kind of hokey and pointless. This was the only one that struck me as particularly beneficial.
I did not agree with the segment on touching. They seemed to try too hard to make a case for doing it, and I'm a big fan of respecting others' boundaries, erring on the side of caution if you don't know them well. One study showed that waiters that touched their clients more made more tips. But that's One Study. Don't. Touch Me.
Maybe I'm not the best person to critique this book...