Michio Kaku, a physics professor at the City University of New York and a "CBS This Morning" contributor, talks about the emergency spacewalk astronauts performed to repair a pump on the International... more 
Michio Kaku, a physics professor at the City University of New York and a "CBS This Morning" contributor, talks about the emergency spacewalk astronauts performed to repair a pump on the International Space Station. less 
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Mon, May 13, 2013 12:42 PM EDT