" Not only had the happy films made them feel better, but they had undone the physiological effects of stress. In other words, a quick burst of positive emotions doesn’t just broaden our cognitive capacity; it also provides a quick and powerful antidote to stress and anxiety, which in turn improves our focus and our ability to function at our best level. "

― Shawn Achor , The Happiness Advantage: The Seven Principles of Positive Psychology That Fuel Success and Performance at Work