Khan AcademyThe Khan Academy is an organization on a mission. They’re a not-for-profit with the goal of changing education for the better by providing a free world-class education to anyone anywhere. 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 thanks to the support of Bill Gates and other philanthropists. While some of the videos are required viewing for rocket scientists, the site has other learning resources in Art History, World History and even videos to help improve SAT scores. Check it out at