Book excerpt: Audible Best Seller of 2017 Inc. 11 Great Business Books New York Magazine Best Psychology Books LinkedIn's 12 Books on Leadership to Read Two mavericks in the field of positive psychology deliver a timely message Happiness experts have long told us to tune out our negative emotions and focus instead on mindfulness, positivity, and optimism. Researchers Todd Kashdan, Ph.D., and Robert Biswas-Diener, Dr. Philos., disagree. Positive emotions alone are not enough. Anger makes us creative, selfishness makes us brave, and guilt is a powerful motivator. The real key to success lies in emotional agility. Drawing upon extensive scientific research and a wide array of real-life examples, The Upside of Your Dark Side will be embraced by business leaders, parents, and everyone else who’s ready to put their entire psychological tool kit to work.