I just found out about this site yesterday, and it might be worth your while knowing about it, too.
HippoCampus.org has free online multimedia lessons for high school and college level.
The topics include algebra, introductory and intermediate calculus, physics, history, biology, and a few other subjects as well.
This whole project is supported by The William and Flora Hewlett Foundation, and is free to use for general public.
I've seen several similar commercial services, so was surprised to see one that's free. It takes a lot of effort to make these interactive lessons, I would think.
Anyway, enjoy if it's your algebra or calculus time in math.
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