Please note: This is a companion version & not the original book. Sample Book Insights: #1 Body language is the phenomenon by which humans communicate using their body's movements. It can take many forms, and it is important to understand how it communicates meaning. #2 The core principles of reading people are rooted in the evolution of behavioral psychology. While psychology as a pure science deals with emotions and the human mind, behavioral psychology takes a deeper look at why humans act the way they do.