" the “7-38-55 rule,” first posited in 1971 by UCLA psychology professor Albert Mehrabian: 55 percent of what you convey when you speak comes from your body language, 38 percent from your tone of voice, and a paltry 7 percent from the words you choose. "

― Brian Christian , The Most Human Human: What Talking with Computers Teaches Us About What It Means to Be Alive