Khan Academy - StumbleUpon - 0 views
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Calvin Kim on 03 Oct 11The Khan Academy is a not-for-profit 501(c)(3) with the mission of providing a world-class education to anyone, anywhere. With over 2400+ videos covering everything from arithmetic to physics, finance, and history and 150 practice exercises, we're helping students learn whatever they want, whenever they want, at their own pace.