Edward L. Deci is one of the world’s leading researchers on human motivation and this book is packed with scientific wisdom—exploring what we know about the power of intrinsic motivation (vs. extrinsic motivation), the importance of autonomy (vs. being controlled) and the need for authenticity (vs. alienation). Hint: If you want happiness, focus on relationships, personal growth and making a contribution; don’t go after fame, wealth and beauty.