Modern Marvels: No program better symbolizes human mastery of machines than does the space shuttle. But the breakups of Challenger and Columbia revealed the program is tragically flawed. Based on the James Chiles's book Inviting Disaster, we look at the 1930 crash of the R-101, a dirigible which, much like Challenger, was rushed into flight and met with disaster, and the Hindenburg, whose 1937 explosion ended dreams of commercial flights for an entire industry. Will the shuttle program go the way of the dirigible?

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Documentary, History