Free Online Learning

So as a help to anyone who needs an online supplement to their studies, I recently came across this website: bookboon.com It has a huge online library of free .pdf textbooks for download on just about any subject. I found it through this address: http://www.marcandangel.com/2010/11/15/12-dozen-places-to-self-educate-yourself-online/ The "Mark and Angel Hack Life" website has this post with a plethora of free online resources on everything from math to english, foreign languages, history, business, and science. I highly recommend these sites for anyone looking to expand what they know.