fastest ways

one of the fastest ways to get a read on another human being is how often they're blinking. If a person is blinking, it's a sign of high stress. If they're blinking really slow, it's a sign of focus. To a psychopath in an interrogation room, they're very focused on prey. Their blink rate will almost be a zero because they're going to manipulate somebody. If I talk, being deceptive, their blink rate can go up to like a 75, 80 without us even knowing it. That blink rate is so reliable, it's unconscious. We don't realize the shifts in blink rate, we don't manually control it very well. If I'm in a conversation, I'm going to start the conversation, say, is the blink rate normal? Does it look fast? Does it look slow? What I'm really looking for in human behavior are changes. On stage, I'm doing a keynote and across eye contact, people, and I start seeing in audience blink rate, I know I need to change the subject or change the topic right away.