was tutoring his cousin 10 years ago when the idea came to him. He started posting his tutorials online, for free, and shared his extensive knowledge with the world. Now the Khan Academy provides thousands of lectures and educational resources. Khan comes to Yountville for a live and thought-provoking presentation Friday, Sept. 26, at the Lincoln Theater, 100 California Drive, Yountville. 6pm. Free. 707.226.8742.