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S1:E4 Dams
First Aired: October 24, 2000
How does a dam resist the crush of millions of gallons of water? Host David Macaulay surveys the dam -- the biggest, costliest structure of all -- from Hoover's concrete arch confronting the Colorado River to the Aswan High Dam, a veritable underwater mountain sitting on the Nile riverbed, holding back a lake the size of England.
