Science and technology

Associated Press
This Aug. 26, 2003 image made available by NASA shows Mars photographed by the Hubble Space Telescope on the planet's closest approach to Earth in 60,000 years. NASA’s robotic rover Curiosity landed safely on Mars late Sunday, Aug. 5, 2012 to begin two years of exploration. The mission cost $2.5 billion. (AP Photo/NASA)

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