Some employees say e-cigarettes increase their productivity and help them steer clear of tobacco. But health regulators are looking into possible risks to e-cig users — and to co-workers. iStockphoto hide caption

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Retailers, including Wal-Mart, are trying to adapt their models to suit urban areas, including this mixed-use retail and residential development in Washington, D.C. Meredith Rizzo/NPR hide caption

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Target Co. estimates that at least 70 million individuals may have had information including their "names, mailing addresses, phone numbers or email addresses" stolen in a recent data breach. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images