Interview Subjects:

* Vicki Bier
professor of industrial engineering
University of Wisconsin-Madison
director, Center for Human Performance and Risk Analysis

William Freudenburg
professor of environmental studies and sociology
University of California at Santa Barbara

Stephen Johnson
associate professor of space studies
University of North Dakota

Charles Perrow
professor emeritus of sociology
Yale University

Henry Petroski
professor of civil engineering
Duke University.

* denotes factchecker

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