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The Khan Academy
 
The Khan Academy is a not-for-profit educational organization with the stated mission "of providing a high quality education to anyone, anywhere".  The Academy supplies a free online collection of more than 1,400 videos on mathematics, science, and economics.  Each video runs for about 10 minutes and is designed to present the material in a friendly, tutor-by-your-side manor.   Click on the link below to get started.  When you get there just scroll down to find links to all the Academy's offerings.