A graduate of Yale Law School, Gretchen Rubin spent a year doing scientific research and practical projects in an attempt to discover how to lead a happier life. This experiment of self-discovery led to her New York Times bestselling book and phenomenon “The Happiness Project.” The book recounts what Gretchen learned about herself and how she was able to become happier and more fulfilled. Gretchen shares her eight personal rules of happiness, which she says can help fill your day with more joy.