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He was a child prodigy, publishing his first paper at 15. Now Stephen Wolfram says he has created a new kind of science based on simple computer programs rather than equations. It’s a bold claim, but it has taken him 20 years-ten of them thinking and working late into the night, and publishing nothing. By a nice irony, that intellectual space was bought by the millions he made out of Mathematica, a computer program that makes complicated mathematics doable for ordinary mortals. Now, at 41, he’s busy gearing himself up for the glare of publicity as he prepares to…