The author and illustrator of the winningly popular book "The Way Things Work" presents a new educational television series on some of the largest structures that humans have built. David Macaulay fully explains the construction, as well as supplementary stories of the structures and their builders, and short instructional segments with young children engaged in simple engineering. In this episode, Macaulay explains the technological marvels that allow a dam to hold back huge and powerful bodies of water.
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