Whether you're a student, teacher, homeschooler, principal, adult returning to the classroom after 20 years, or a friendly alien trying to get a leg up in earthly biology - Khan Academy's personalized learning library is available to you, for free. Or, if you're feeling particularly adventurous, learn how fire-stick farming changes the landscape of Australia. Get a head start on next semester's geometry. Spend an afternoon brushing up on statistics.
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