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Khan Academy is a not-for-profit organization with the goal of changing academics for the better by providing free, world-class education for anyone anywhere. All of its site's resources are available to anyone and so it doesn't matter if you're a student, teacher, home-schooler, or principal. With over 3,200 videos on everything from arithmetic to physics, finance, and history and hundreds of skills to practice, they're on a mission to help you learn what you want, when you want, at your own pace.