Why is it so hard to break bad habits and replace them with good ones? You may think it all comes down to willpower. But social psychologist Wendy Wood says that if you really want to change your life, you need to tap into your unconscious mind. She would know. Wendy is the world’s foremost expert on habits and the author of “Good Habits, Bad Habits: The Science of Making Positive Changes That Stick.” Today, she chats with Next Big Idea Club curator Adam Grant about harnessing the science of habit formation to improve your life for the better. This conversation was among the first that we aired on this podcast, and we left a lot of great moments on the cutting room floor. Today, we’re restoring them. What follows is an extended version of Wendy and Adam’s conversation with new insights about overcoming chronic lateness, developing sustainable exercise routines, and making New Year’s resolutions that last past February.

The science is clear: people who engage in spiritual practices live longer, happier, healthier lives. For the past few years, two researchers — Dave DeSteno, who runs the Social Emotions Lab at Northeastern, and Lisa Miller, founder of the Spirituality Mind Body Institute at Columbia — have been trying to figure out why. They’ve found that treating religious rituals as tools we can adapt to our individual needs and values can help all of us — staunch atheists and devout believers alike — live more meaningful, successful, and connected lives. In this episode, Dave and Lisa share what they’ve learned, discuss the fraught relationship between science and organized religion, and offer tips for making the most of your holiday rituals.