See the full episode at http://video.pbs.org/video/1619317222How did medieval builders reach such spectacular heights using only hand tools to create the great cathedrals? NOVA teams perform hands-on experiments to learn the architectural secrets that the cathedral builders used to erect their towering, glass-filled walls and reveal the hidden formulas, drawn from the Bible that drove medieval builders ever upward.http://www.pbs.org/nova
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