As a baby, Ari Weinstein was mesmerized by light switches. By 2, he had mastered the family TV, stereo, and VCR and soon was taking apart mechanical toys. At 6, he disassembled an old computer, reassembled it, and rejoiced when it still worked. Now 15, the Mount Airy youth is the toast of the Internet.
Teen whiz shakes up Apple's world
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