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This illustration released by the University of Santa Cruz shows a super-Earth type planet, named GJ1214b, left, in the atmosphere. For the first time astronomers probed the atmosphere of this planet by observing chemical signatures imprinted on light from the planet's host star as it filtered through the planet's atmosphere. GJ1214b is about 2.6 times Earth's radius, but about 6.5 times its mass, and it circles a red dwarf star, top right. (AP Photo/University of California at Santa Cruz, Paul A. Kempton)  NO SALES.
Photo by: Paul A. Kempton
This illustration released by the University of Santa Cruz shows a super-Earth type planet, named GJ1214b, left, in the atmosphere. For the first time astronomers probed the atmosphere of this planet by observing chemical signatures imprinted on light from the planet's host star as it filtered through the planet's atmosphere. GJ1214b is about 2.6 times Earth's radius, but about 6.5 times its mass, and it circles a red dwarf star, top right. (AP Photo/University of California at Santa Cruz, Paul A. Kempton) NO SALES.

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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.