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Khan Academy

Khan Academy offers a great many free tutorials about quite a range of subjects, including science and math. Right now they have over 2100 10 minute tutorials. I have been reviewing the physics play list. I'm not really learning anything new, but I am refreshing what I already know and have to a large extent forgotten. I don't think they have any really advanced courses, but there is enough to get a person started in the groundwork of physics. In math they seem to go a little bit further. They have a pretty good sized play list for linear algebra. I haven't looked at any of the math tutorials yet, but I expect I will need to before I get through the physics playlist.

Bill Gill

Who makes the lectures, and how do we know they are accurate?

I'm not sure he has done all of them (over 2100 would be a lot) but the physics lectures, and I think the math lectures, are done by Sal Kahn. I have been running through the physics lectures and haven't spotted an really egregious errors. Some things I thought that he should have approached differently, but that is just my way versus his way. The only thing I have seen that I think might be a real error is that in his lectures on unit vectors he shows position P as a vector. This of course is wrong, since position does not have amplitude or direction. But what he shows of how to use the vectors is correct.

Bill Gill