The Course That Taught the World How to Be Actually Happy
In January 2018, Yale University opened enrollment for a new course called "Psychology and the Good Life." Within weeks, nearly one in four of all Yale undergraduates had signed up, making it the most popular class in the university's 300-year history. It was taught by Dr. Laurie Santos, a cognitive scientist whose decades of research into the human mind had led her to a clear conclusion: most of us are thinking about happiness all wrong.
Soon after, Yale made the course available to the rest of the world. Repackaged as The Science of Well-Being on Coursera and more recently YouTube, it became one of the most-enrolled online courses ever created, attracting millions of learners around the world who wanted evidence-backed answers about how to be happy.
Who Is Dr. Laurie Santos?
Dr. Laurie Santos is the Chandrika and Ranjan Tandon Professor of Psychology at Yale, the director of its Comparative Cognition Laboratory, and the host of the popular podcast The Happiness Lab. Recognized by Popular Science as one of its "Brilliant Ten" young scientists and named a "Leading Campus Celebrity" by TIME magazine, Santos has spent her career studying both human and primate cognition — and what those studies reveal about the quirks, biases, and blind spots hardwired into our thinking.
Her central finding is that our brains are systematically bad at predicting what will make us happy. But once you understand why, you can start to do something about it.
"We have strong intuitions about what will make us happy — a higher salary, a better grade, a nicer car. But the scientific research shows, time and again, that these intuitions are almost always wrong."
What the Course Teaches
Spanning ten weeks on Coursera or a playlist on YouTube, the course follows a two-part framework: first, learn why your intuitions about happiness fail you. Then, discover what the research says works, and practice it. The practice is required: each week, students are assigned "rewirements" — concrete behavioral challenges designed to interrupt old mental patterns and build new, happier ones.
Santos draws on decades of positive psychology research to challenge common beliefs — that wealth, status, achievement, or the right circumstances are the keys to a fulfilling life. Instead, she points toward a cluster of habits and practices with far stronger scientific support.
The Misconceptions of Happiness
We consistently overestimate how much better (or worse) life events will make us feel — a phenomenon researchers call "impact bias." Santos explains why our predictions about our own emotions are reliably off-target.
The GI Joe Fallacy
Knowing something isn't the same as doing something. The course addresses why intellectual understanding of well-being strategies rarely changes behavior — and what actually does.
Hedonic Adaptation
Humans adapt to new circumstances — good or bad — with remarkable speed. Understanding this "adaptation" explains why the things we chase rarely deliver the happiness we expect.
What Works
Gratitude practices, social connection, acts of kindness, mindfulness, sleep, and exercise all have robust scientific backing. Each one is a measurable intervention.
The "Rewirements": Learning by Doing
One of the course's most distinctive features — and arguably the reason it has such a lasting impact on so many students — is its insistence on behavioral practice. Knowledge alone, Santos argues, is insufficient. Real change requires breaking habits and building new ones through direct experience.
Weekly rewirements might include keeping a gratitude journal, performing random acts of kindness, practicing savoring (deliberately pausing to appreciate positive experiences), or committing to a consistent sleep schedule. Students frequently report that these exercises — more than any lecture — are what changed how they approach their own happiness.
Science-Backed Happiness Practices from the Course
Write down three things you're grateful for, every day
Perform random acts of kindness — especially for strangers
Invest in social connections over material possessions
Practice mindfulness and present-moment awareness
Prioritize sleep — it's among the strongest predictors of daily mood
Exercise regularly, even briefly
Savor positive experiences rather than rushing through them
Spend money on experiences, not things
Why It Resonated With Millions
The course arrived as public conversations about mental health, burnout, and the emptiness of achievement culture were intensifying. Yale students — among the most academically accomplished young people in the world — were struggling with anxiety, perfectionism, and a gnawing sense that all their striving wasn't making them feel the way they expected to feel. That made them a strong case study for Santos' thesis.
But the course's online version proved equally resonant across demographics, professions, and countries. From retirees to corporate executives to teenagers, students praised it for helping them understand their own minds using peer-reviewed science rather than pop psychology, explained with warmth and wit.
"I applied the techniques — meditation, gratitude, exercise — and I feel more satisfied with my life than I did two months ago. If you want to be happier, this course will teach you how. You don't have to wait for your circumstances to change."
— Coursera Student Review
More From Santos
The original course has since grown into a wider set of projects. Santos has released specialized versions tailored to teens, parents, and other audiences — each applying the same rigorous, research-driven framework to the particular challenges of different life stages. She also hosts The Happiness Lab podcast, produced by Pushkin Industries, which extends the course's ideas into long-form conversations with researchers, thinkers, and everyday people.
The course itself is available for free on Coursera (video-only), on YouTube, and through Yale Online — with a paid certificate option for those who want formal recognition of their completion.
Is It Worth Your Time?
The short answer is yes — with one caveat. This is not a passive experience. The course rewards those willing to do the homework, sit with the uncomfortable idea that their deepest assumptions about happiness may be wrong, and experiment with practices that might feel awkward or unfamiliar at first.
For anyone who has ever wondered whether there's a better way to approach their own happiness — whether you're a student, a professional, a parent, or simply someone trying to live a little more intentionally — The Science of Well-Being offers a rigorous, accessible, and useful answer.
