Read Stuart Brown's posts on the Penguin Blog. From a leading expert, a groundbreaking book on the science of play, and its essential role in fueling our intelligence and happiness throughout our lives.We ve all seen the happiness in the face of a child while playing in the school yard. Or the blissful abandon of a golden retriever racing with glee across a lawn. This is the joy of play. By definition, play is purposeless and all-consuming. And, most...