most of what we've beeninvesting in is an extension of some of that software that i started with my cousins2005. where it's students can go, and learn at their own pace, it understands what they know or don't know. partnering with college board to be the official test prep for the new sat. emily: so by some measure, khan academy already is the largest school in the world. one of your investors, yuri milner, says you are the world's first superstar teacher. sal: actually, we view it as a huge responsibility. you can imagine a kid in a village in africa or the slum in calcutta who gets access to a low-cost phone or tablet device that, in five or 10 years,will be everywhere. i like to think that for every albert einstein we found, how many of them did we not find? how many got squandered because they didn't learn to read, get an education, etc., etc. imagine if we could increase by an order of magnitude, by a factor of 10, the number of albert einsteins in the world. the number of people who can do can cancer research. the number of people who can think about alternative energy. this could be