All of the Khan Academy 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.
These online materials cover subjects ranging from math and finance to history and art. With thousands of bite-sized videos, step-by-step problems and instant data, Khan Academy provides a rich and engaging learning experience. You can earn points and badges along the way, and coach others as well.
Use your Google, Facebook or personal email account to sign in and get started right now. Signing in gives you the ability to track your own progress and earn points and badges.
All Khan Academy content is available for free at www.khanacademy.org