This document discusses the importance of body language in communication. It notes that only 7% of communication is through spoken words, while 38% is through voice and tone, and 55% is through body language. It provides examples of body language signals, including signs of lying such as covering the mouth, eyes shifting direction, increased sweating, and changes in pupil size. The document concludes that modern humans are worse at reading body language than ancestors because we are now more focused on words than body signals.