Challenge yourself and learn something NEW or just brush up on something you thought you knew...
Check out the many other MOOC's available. Expand your knowledge base. The more a person learns, the more that person needs to know...
A wise person realizes this insatiable thirst, yearns for more knowledge from within this world, and grasps at it with a curious hand.
Read about more of my experience and find a List of Resources to find something for you - all FREE http://elisabethzguta.blogspot.com/2014/02/free-courses-to-help-you-expand-your.html