A man pushes a friend in a wheelchair following an event in Beijing to raise awareness of accessibility issues for the disabled. Ng Han Guan/ AP Photo hide caption

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Karen Butler could get her American accent back with intensive speech therapy, but she likes her new one. Jane Greenhalgh/NPR hide caption

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XMRV, a mouse virus, may be an artifact of laboratory experiments rather than the cause of chronic fatigue syndrome. Whittemore Peterson Institute hide caption

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