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HOW WE GOT TO NOW WITH STEVEN JOHNSON | "Clean" An Inside Look | PBS

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www.pbs.org/howwegottonow
Wednesdays, October 15, 9/8c and October 22-November 12, 10/9c.
Just five generations ago there was no comprehensive sewer system in America. Then, Engineer Ellis Chesbrough came up with the fascinating idea to raise the city of Chicago using railroad technology in order to build the first modern sewer network.
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