Khan Academy | Watch. Practice. Learn.
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The Khan Academy is an educational organization, created in 2006 by MIT graduate educator Salman Khan. With the stated mission of “providing a high quality education to anyone, anywhere”, the website supplies a free online collection of more than 2,600 micro lectures via video tutorials, stored on YouTube, teaching mathematics, history, finance, physics, chemistry, biology, astronomy, economics and computer science.
Khan originally created the site to assist a cousin and some of her friends with math and science problems. Over time his collection of video lectures and tutorials grew to incorporate multiple learning disciplines and to include a web-based exercise system that generates problems for students based on skill level and performance.
All of the site’s resources are available to anyone. It doesn’t matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. The Khan Academy’s materials and resources are available to you completely free of charge.