Why is it so hard for us to form good habits—and so easy to form bad ones? Most people turn to the self-help section to find answers, but this is really a question for behavior science. Katy Milkman is a professor at The Wharton School of Business at the University of Pennsylvania and co-directs the Behavior Change For Good Initiative with Angela Duckworth. Her best-selling book, How To Change: The Science of Getting From Where You Are To Where You Want To Be, explores that best research—from “nudges” to “temptation bundles”—on how to change our behaviors and habits for good.