My Carpe Diem Life: Gretchen Rubin, The Four Tendencies, and Why I Suggest Becoming a QuestionerYesterday I attended an Action for Happiness event featuring Gretchen Rubin. She co-hosts with her sister, Elizabeth Craft, a very popular ...My Carpe Diem Life: Gretchen Rubin, The Four Tendencies, and Why I Suggest Becoming a Questioner