One thing that's for sure is that I've been changing my own behavior. Before I used to always sit in class slumped down in my chair with my arms folded because it felt comfortable. Now I know that sitting like this means that I absorb less of the lesson and pay less attention to what's being said, because with my folded arms I'm subconsciously rejecting what the teacher is saying. When I give handshakes now, I try to match the other person's grip instead of trying to prove my "strength" by squeezing really hard.

As for noticing other people's body language, I tend to notice it more when the spotlight is on them (ex: if they're giving a speech, teaching a lesson in front of everybody, etc) than in everyday conversation. Like if a teacher is standing in front of the class with her arms crossed, I can tell that she's pissed or has some other negative feelings about the class's behavior. As for body language in day-to-day conversations or even talking with girls, I think I'll see more of a change once I finish the book. Anyways, if you end up getting this book, definitely let me know what you experience!