This is an episode from our archives.

At Yale University, psychology professor Laurie Santos saw firsthand how so many college students were anxious or depressed. So she decided to teach a class on the science of happiness — and how to apply it in real life. It became the school’s most popular course ever. Apple News In Conversation host Shumita Basu spoke with Santos about her podcast, The Happiness Lab, and the evidence-based strategies that can help us improve our lives and outlook. Below are excerpts from the interview.