Nova: Season 48, Episode 50

48 - 50: High-Risk High-Rise

Skyscrapers are gleaming symbols of prestige and an ingenious way to save space in dense urban areas. But as buildings rise ever higher, what are the risks of these architectural behemoths? Do we truly know how they will hold up in earthquakes, fires, and other potential disasters? What have--or haven't—we learned from past tragedies?