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GWEN IFILL: Today marks the halfway point in a year-long mission on the International Space Station. The goal? To figure out the long-term effects on the human body from being out of this world.
They are comparing NASA astronaut Scott Kelly, up in the station, with his identical twin brother, retired astronaut Mark Kelly, back here on Earth.
The post What NASA’s twin tests will teach us about life in space appeared first on PBS NewsHour.