Joe Testing News Today

Martha: a bold new experiment. astronaut twins mark and scott kelly will take part in an unprecedented asked youy. the brothers will under joe testing to understand the long-term effects of prolonged weightlessness on the human body. mark joins us this morning. >> great to be here. whose idea waits and what do they expect to learn? >> well, you know, it was the nasa researchers idea. my brother asked the get after he was assigned to go into space for a year. for these long duration missions its ...