Has NASA's safety culture changed?

"Everything is about return to flight and nothing is about return to right … return to the right culture," says Dr. Jon Clark, a NASA neurologist who lost his astronaut-wife aboard Columbia.

"NASA is making solid progress," notes the behavioral science company hired to improve the space agency's culture.

"We haven't really changed the way we're doing business and making decisions, so we're headed down the same road we've been on," says former space shuttle commander James Wetherbee, who quit NASA out of frustration in January.