I have completed several college courses on Coursera, for free. First was brother-in-law Steve Marshak’s geology class. He’s a gifted teacher and you can learn about earthquakes, volcanoes, fracking, and how the earth moves.
My favorite discovery was A Life of Happiness and Fulfillment. The professor is lively and backs up his systematic survey of effective approaches and to increasing your happiness with solid research and interviews with known scholars, prepared with a light heart and good humor. I confess I skipped the exercises but I put the lessons to use almost every day.
://www.coursera.org/c https ourses?query=Happiness