Even if all you do is clutch the cozy, steaming mug, you may find yourself feeling more positive and receptive. In an experiment at Yale University, researchers asked volunteers to handle a hot cup before evaluating a stranger. Compared to people who held a cold cup, hot-handlers gave the stranger more favorable ratings, perceiving her as warmer. It’s a trick of the insula: Physical warmth activates the same neural circuits in the brain associated with feelings of emotional warmth. Warmer hands, warmer heart.