Gretchen Rubin, author of the new book "Secrets of Adulthood: Simple Truths for Our Complex Lives," joined us to share how an aphorism—the ancient literary discipline that demands that a writer ...

I've spent 12 years studying happiness and human nature, and in my new book, "Secrets to Adulthood: Simple Truths for Our Complex Lives," I share concrete and manageable advice that solves common ...