“The mystery is how we keep getting away with it. Our bodies expose us in every way. Hearts race, sweat drips and micro-expressions leak from small muscles in the face. We stutter, stall and make Freudian slips. “No mortal can keep a secret,” wrote the psychoanalyst in 1905. “If his lips are silent, he chatters with his fingertips. Betrayal oozes out of him at every pore.”“