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About the Khan Academy: The Khan Academy is a not-for-profit with the mission of providing a world-class education to anyone, anywhere. We are complementing Salman's ever-growing library with user-paced exercises--developed as an open source project--allowing the Khan Academy to become the free classroom for the World.

Watch. Practice. Learn almost anything for free. With a library of over 2,700 videos covering everything from arithmetic to physics, finance, and history and 276 practice exercises, we're on a mission to help you learn what you want, when you want, at your own pace.