Summary: In this excerpt from NOVA's "Space Shuttle Disaster," get a glimpse of the factors that led to one of the worst accidents in the history of America's space program. Watch NOVA every Wednesday night on PBS. Or join us online at pbs.org/nova. Funding for NOVA is provided by ExxonMobil, David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. To learn more, visit http://www.pbs.org/nova/columbia
