David Muir Sits Down With Michael Massimino

The astronaut behind the new film "Gravity" is "World News" Person of the Week.
3:00 | 10/03/13

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Transcript for David Muir Sits Down With Michael Massimino
One is talking. One step away from. One on one with the real life hero who risked it all tomorrow on world news with Diane Sawyer.

This transcript has been automatically generated and may not be 100% accurate.

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