Looking for something to expand your mind without jumping into a whole degree plan? Maybe looking for an education bullet on your next EPR? There are some sites out there that allow us to take classes from universities like Wharton, Harvard, MIT and just about any other one you can imagine for free. These allow us to dip our toes in the water and gain some more knowledge on a topic of interest. And I have to admit it is fun saying I took a course from Harvard on my EPR.
I have done many courses from Coursera and have had great experiences each time. EdX is new to me, but looks similar in quality and content. If you want an actual certificate from the university, you have to pay a fee, but otherwise it is free.
Here are the two sites discussed above:
Deliberate Development 