Since 2008, Massive Online Open Courses have been providing free or low cost high quality college courses.  There are several sites that offer outstanding courses from universities around the world.

EdX.org is based in Cambridge, MA and governed by Harvard and MIT. You can read more about their principles and goals at https://www.edx.org/about-us.  As with most MOOCS, you can take courses live, or you can audit an archived course that has ended but stored online and still available. More about EdX later.

Coursera’s mission is to “provide universal access to the world’s best education,” and has partnered with major universities all over the world. Like EdX, it has apps for your Android and iPhone as well, to make it even easier to take courses.

iVersity is a European based MOOC with a variety of courses. EdX, Coursera, and iVersity all offer courses in languages other than English if you also want to practice your other-than-English language skills.

You can also use these as resources for students, and there are some geared just to students with resources for teachers and parents.  Khan Academy is a good resource and also has test prep for the SAT and other tests. If you, or someone you know, are interested in tech and coding, there is the Code Academy and Udacity. The World Wide Web Consortium also has classes with certificates you can earn for learning various computer languages and coding.

For a long list of free courses, MOOCS, and other free learning sources, take a look at Open Culture.

I hope you check these out and find something to stretch your mind. The course you take may be work or career related or just something you are interested in and take for fun. The most recent course I took on EdX was called “Chinese Thought: Ancient Wisdom Meets Modern Science” taught by Edward Slingerland of the University of British Columbia. Slingerland did an excellent job of looking at Chinese philosophers such as Confucius, Mencius, Mozi, Laozi, Zhuangzi, and others and using modern neuroscience, psychology, anthropology and sociology research to examine the ethical models of human behavior that each philosopher espoused.  Do expect to spend time on courses. There are lectures (the EdX ones I have taken are not classroom lectures but more like very well made documentaries), reading assignments, message boards for class participation, tests, and papers. There are certificates for passing. Be sure to read the details on the site where you sign up.  Give your brain a work out, and keep learning and growing your entire life.