Anyone take any classes on Khan Academy (www.khanacademy.org)? I just learned about it today. The classes are free. I could really use a refresher on advanced math, i stunk at precalculus and calculus. One of the major reasons why I dropped out of the computer science major when I was in college (1990's). Also because I disliked programming. And they weren't even using C. It was frustrating.