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**FILE** A single cell is removed from a human embryo to be used in generating embryonic stem cells for scientific research. (Associated Press)

**FILE** A single cell is removed from a human embryo to be used in generating embryonic stem cells for scientific research. (Associated Press)

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The biggest villains in sports

Ray Rice is just the latest famous athlete to draw the ire of the American public. Sports stars haven’t always acted as role models — both on and off the field.