Sal Khan, you can count Bill Gates as your newest fan. Gates is a voracious consumer of online education. This past spring a colleague e-mailed him about the nonprofit KhanAcademy.org, a vast digital trove of free mini-lectures all narrated by Khan, an ebullient, articulate Harvard MBA and former hedge fund manager.
Gates replied within minutes. “This guy is amazing,” he wrote. “It is awesome how much he has done with very little in the way of resources.” Gates and his 11-year-old son, Rory, began soaking up videos, from algebra to biology.
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