Thirty-three-year-old Salman Khan recently quit his job as a hedge fund analyst to devote himself to an unpaid job teaching math on the Internet. He has posted 1,200 lessons on YouTube, which appear on an electronic blackboard, and range in subject from basic addition and advanced calculus to science and finance. And they are free. Khan lives in California's Silicon Valley with his wife, a rheumatologist in training at Stanford, and their new baby. He got the idea for Khan Academy four years ago, when he taught a young cousin how to convert kilograms to grams. Many American students have trouble with math, and studies show they lag behind their counterparts in Asia and Europe in both math and science. With Khan's help, his cousin got good at math, and he eventually had a new career tapping into anxieties around the world. Now he records his lessons from a converted closet in the back of his bedroom. Internet instruction, be it the Khan Academy or taped university lectures, could revolutionize education in remote Third World locations, where access to high-quality instruction is frequently unavailable.
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