Is it really possible to change your entire personality in a year? An award-winning journalist experiments with her own personality to find out—and reveals the science behind lasting change.

Research shows that you can alter your personality traits by behaving in ways that align with the kind of person you’d like to be—a process that can make you happier, healthier, and more successful. Olga embarked on an “experiment” to see whether it’s possible to go from dwelling in dread to radiating joy. For one year, she clicked “yes” on a bucket list of new experiences—from meditation to improv to sailing—that forced her to at least act happy. With a skeptic’s eye, Olga brings you on her journey through the science of personality, presenting evidence-backed techniques to help you change your mind for the better.

Olga Khazan is a staff writer for The Atlantic and the author of Weird: The Power of Being an Outsider in an Insider World. She has written for The New York Times, the Los Angeles Times, and other publications. Her new book is Me, But Better: The Science and Promise of Personality Change.