(2018) Gretchen Rubin’s year-long experiment to discover how to create true happiness. Drawing on cutting-edge science, classical philosophy, and real-world examples, Rubin delivers an engaging, eminently relatable chronicle of transformation. This special 10th Anniversary edition features a Conversation with Gretchen Rubin, Happiness Project Stories, a guide to creating your own happiness project, a list of dozens of free resources, and more.