Laurie Frick imagines a future in which your smart watch will know how your body is responding to someone. Then it will combine with Facebook data about their personality. And that will let you know whether that person makes you lethargic, raises your blood pressure or depresses you. “If you start training people that, ‘Look at what’s happening to your inflammation levels or whatever. This is the best thing for you and you can let go of the guilt.’ “