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What NASA’s twin tests will teach us about life in space

Clip: 9/15/2015 | 2m 25s

What NASA’s twin tests will teach us about life in space

What are the long-term effects of living in space? Astronaut Scott Kelly is now halfway through a year-long mission. NASA offers a progress report, comparing Scott with his twin brother, retired astronaut Mark Kelly, who remains on Earth.

09/15/2015 | Rating NR

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