Spend an afternoon brushing up on statistics. Discover how the Krebs cycle works. Learn about the fundamentals of music notation. Or, if you’re feeling particularly adventurous, learn how fire-stick farming changed the landscape of Australia. It doesn't matter if you are a student, teacher, homeschooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology—Khan Academy's materials and resources are available to you completely free of charge
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