So I went to one of the libraries I use to go and I found this book that said it would help you decodify body language. Me, having no idea of what Synergologie (with trademark) is, and being a free read, picked the book up out of curiosity. And well, it teaches nothing, apart from the idea that people may have tics, twitches (really?, I didn't know that) or random ideas like that scratching the underside of your eye means the person is interested in the topic being talked about (I made this one up as an example). The only person you will see different if you read this book is the one that recommends it to you.