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Does big data have big problems? We ask what companies are doing with the avalanche of digital information all of us leave behind. Microsoft's economics researcher David Rothschild tells what big data is used for and that it's not always useful in making predictions. Also, the ��ѿ��ý's Rahul Tandon reports from Calcutta on Indian companies turning to astrology to help their business, and James Srodes in Washington wonders if computers are merely taking away jobs, or also creating new ones.