Best free interactive websites?

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I am looking at going back to school and doing a major in physics and although I know of a good math online software for studying. I was wondering if there was a great source for learning everything that I can about physics.

I don't think that there are very many interactive physics websites. Here is one that I found: http://www.physicsclassroom.com/

You might want to ask at physicsforums.com. There are a lot of professional scientists, engineers, and teachers on that forum, and it's a great place to ask a question when you are in school.

To watch video lectures, well, I haven't tried it myself, but there is khanacademy. Also, Harvard, Stanford, and MIT have free course material online: video lectures, notes, exercises, and tests. I don't know how many physics classes they each have available, though.