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Is taking risks really a part of a gas-pipeline company's culture? Just ask John Arnold, the 26-year-old chief of natural-gas derivatives, who after nine hours and $1 billion in trades last Wednesday had this to say: "You can't turn away for a minute or you get picked off." That has happened to too many traditional companies because they were unable to find a niche in the new economy. Enron, however, has traded its way into a starring role, and now it hopes it is ready for the movies.