The course, The Science of Well-being areas has more than 1.5 million subscribers and with more than 19 million views of the course page, it looks like that number will rise substantially.
Quoting the course page, Yale describes the course as follows...
In this course you will engage in a series of challenges designed to increase your own happiness and build more productive habits. As preparation for these tasks, Professor Laurie Santos reveals misconceptions about happiness, annoying features of the mind that lead us to think the way we do, and the research that can help us change. You will ultimately be prepared to successfully incorporate a specific wellness activity into your life.
You can enroll into the course and work through it are your own pace here and at...