"The Happiness Project" by Gretchen Rubin is a self-help book that explores the author's year-long quest to discover the keys to happiness. With insights from psychology, social science, and personal growth, Rubin shares her experiments and findings in a witty and engaging style. The book includes illustrations and contains 336 pages of thoughtful reflections on topics such as emotions, personal growth, and general happiness. Published by HarperCollins in 2011, this trade paperback is a valuable resource for anyone seeking to enhance their own well-being and increase their joy in life.