Khan academy - 8 views
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wittscience on 29 May 14Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
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wittscience on 29 May 14Khan Academy is a free resource that students can use at home or school. Lawrence