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** FILE ** This mouse was produced from stem cells coaxed from skin tissue of adult mice and then reprogrammed. Two teams of Chinese scientists have made a major advance in the development of a new kind of stem cell that doesn't involve destroying embryos. (AP Photo/Nature, Dr. Qi Zhou)
Photo by: Dr. Qi Zhou
** FILE ** This mouse was produced from stem cells coaxed from skin tissue of adult mice and then reprogrammed. Two teams of Chinese scientists have made a major advance in the development of a new kind of stem cell that doesn't involve destroying embryos. (AP Photo/Nature, Dr. Qi Zhou)

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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.