Over six million students around the world are familiar with his voice and his online videos, featuring colorful chalkboard-style drawings. But many may not know his face: Sal Khan is the founder of Khan Academy and a pioneer in the online education movement. His videos are short and simple and available to anyone around the world, for free. In an interview at his Silicon Valley offices, Khan talks with guest-host Thuy Vu about the importance of self-paced learning and what his approach can offer the California education system.

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• Khan Academy