“More and more of us now express our emotions through the devices and software we rely on in our everyday lives. E-mail, text messages, social media, video chat—each platform demands of us different expressions of ourselves. And in the near future, we will have a new range of technologies at our disposal—sensors, monitors, and software with the power to track, nudge, persuade, and coerce. What the clock did to time, technologists hope to do to emotion—regulate and regiment it, measure and monitor it. But taming the temperamental beast that is human emotion might prove a challenge that contemporary technology is unfit to take on.”