Science and technology

Associated Press
In this May 29, 2014 photo, Elon Musk, CEO and CTO of SpaceX, introduces the SpaceX Dragon V2 spaceship at the SpaceX headquarters in Hawthorne, Calif. On Tuesday, Sept. 16, 2014, NASA will announce which one or two private companies wins the right to transport astronauts to the International Space Station. The deal will end NASA's expensive reliance on Russian crew transport. The contenders include SpaceX, Sierra Nevada Corp., and Boeing. (AP Photo/Jae C. Hong, file)

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