The most popular class in the history of Yale is now available online, joining 20 other Coursera classes taught by Yale faculty.

The class, Psyc 157, “Psychology and the Good Life,” is taught by psychology professor Laurie Santos. Nearly a quarter of all Yale undergraduates have enrolled in the class in its inaugural year — a fact that attracted media attention around the globe.

The online course, titled “The Science of Well Being,” features lectures by Santos on things people think will make them happy but don’t — and, more importantly, things that do bring lasting life satisfaction. Registration is now open.