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Actor Sean Penn is profiled and interviewed about his career.

Throughout history, the builders and engineers who paved our way out of the caves and into the modern world have also caused some of our worst disasters. What happens when their calculations prove wrong and it all comes tumbling down? From Hammurabi’s days, when the first building laws were instituted, to today’s potential nuclear or chemical disasters that can spell death for thousands, we’ll take a harrowing tour through some of history’s greatest engineering mistakes.

Actor Laurence Fishburne is profiled and interviewed.