Pandit has experience running a complex investment bank, but little background as the chief of a global consumer operation.

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"Patrick Duffy has a complex medical history and a number of background risk factors that indicated an increased risk of abuse of medication and self harm while in custody, " she said.

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But some recent social science research reveals a more likely and complex explanation: People do things because people who look and talk like them or share the same background do those things.

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