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The GM-Carnegie Mellon Collaborative Research Labs' self-driving sport utility vehicle called Boss, a robotized Chevrolet Tahoe, goes through its paces loaded with equipment that allows it to operate without a driver. (Carnegie Mellon University)

The GM-Carnegie Mellon Collaborative Research Labs' self-driving sport utility vehicle called Boss, a robotized Chevrolet Tahoe, goes through its paces loaded with equipment that allows it to operate without a driver. (Carnegie Mellon University)

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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.