On the eve of the 50th anniversary of the Mission Control Center at NASA's Johnson Space Center in Houston, NASA Commentator Pat Ryan talks with Norm Knight, the chief of the Flight Director Office at JSC, about the establishment the mission control center concept and the development of the center through the history of America’s human spaceflight program. Watch Space Station Live, weekdays at 11am eastern. http://www.nasa.gov/multimedia/nasatv/index.html | International Space Station