Summary: NASA engineer Rodney Rocha, whose warnings and calls for action went unheeded, speaks out about the Columbia Space Shuttle disaster. This podcast was produced by David Levin. Interview by Arun Rath. NOVA is produced by WGBH in Boston. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and public television viewers. For more on E = mc2, visit www.pbs.org/nova/columbia
