Khan Academy Mountain View, CA
A free world-class education for 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. Khan Academy's materials and resources are available to you completely free of charge. Students can make use of our extensive library of content, including interactive challenges, assessments, and videos from any computer with access to the web while coaches, parents, and teachers have unprecedented visibility into what their students are learning and doing on the Khan Academy. The vast library of content covers math, science topics such as biology, chemistry, and physics, and even reaches into the humanities with playlists on finance and history. Track your learning with powerful statistics.