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Photo by: Steven Senne
Cathryn Sundback, director of the tissue engineering lab at Massachusetts General Hospital, holds a laboratory rat implanted with a human-scaled ear made from sheep cells at the lab in Boston on July 2, 2012. The same lab also has created ears from human cells and hopes to start implanting them in patients in about a year. With ears destined for patients — they would just be grown in a lab dish until they're ready to implant. (Associated Press)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.

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LeBron James' 'I can't breathe' T-shirt the latest display of politics on the playing field

Cleveland Cavaliers superstar LeBron James on Monday night during pregame warmups wore an “I can’t breathe” T-shirt, referring to Eric Garner, who died after a New York police officer placed him in a chokehold during an arrest for selling loose cigarettes. The shirt, one of several featuring the slogan that have been seen around the league in recent days after a grand jury declined to indict the officer last week, is just one in a long history of political statements made by athletes on the playing field. Here are some others.