Khan Academy serves up hundreds of thousands of online lessons every day, and is changing education as we know it. The site offers easily digestible, 10-minute lesssons on a wide variety of subjects that allow students to learn at their own pace. 

The man behind this innovative non-profit is Sal Khan, who teaches all of the lessons using Adobe Illustrator, a natural talent for teaching, and above all, a unique and refreshing approach to preparation. Khan shares his advice with Big Think, and educators everywhere: prepare your thoughts, not a script. Watch here: