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Have we been getting it wrong when it comes to teaching children? Sugata Mitra's work certainly suggests so. He's the professor of educational technology who 15 years ago installed a computer in a hole in a wall in a Delhi slum and allowed the local children free access. Even without a formal education they got to grips with it in no time. Since then, Professor Mitra's been watching other groups of children teaching themselves with some remarkable results. He's now launching a whole school in Delhi based on his ideas, called the School in the Cloud.