It may be surprising to know that you can educate yourself for free on the internet. Even from outstanding schools like MIT. But be advised, you won't recieve any credentials from the school to put towards a masters degree or anything like that. But if you find knowledge generally important and have the time, you can delve into the principles of astronomy, physics, biology, or any number of subjects.
I'll start to compile a number of sites devoted to free learning and I'll keep them in a tab on the sidebar.
For now, look here.