MIT publishes virtually all of its course materials online for free. http://ocw.mit.edu/index.htm You can take hundreds of college courses completely free, in your own time. This is the Massachusetts Institute of Technology- one of the premier technical universities in the world – offering courses online because they want more people educated. The list of courses is here http://ocw.mit.edu/courses/index.htm Something every one should know and use. Please share this valuable resource with everyone you know.