The Educational Resources thread we had seems to be one of those which have (hopefully only temporarily) vanished into thin air, however pending it's reappearance, I thought I'd post this - The Khan Academy - which is a completely free academy, almost exclusively on YouTube, which has over 1,000 videos on a range of subjects from the most basic of maths through to using the Laplace Transform to solve a nonhomogenous equation (whatever that is!), grouped into maths, physics, chemistry, biology, finance and investing. I haven't looked at it in detail, but at first glance it looks like a wonderful resource for anyone who wants to increase their knowledge in any basically mathematical or scientific subject.

There's a good introductory video to watch here:-



(If the in-line video doesn't work for you, go to YouTube - The Khan Academy)