Here are some youtube videos, or articles that caught my eye - from the New York Times, Consumer Reports, Popular Science etc.
Thursday, September 17, 2015
Concrete documentary
At 10:13, they describe the 8 different gradations of concrete used by the Romans in constructing the Pantheon, going from large aggregate at the base for strength, to using 90% pumice at the peak for light weight.
At 22:07, the Hoover dam took 21,000 men to build, and took three lives of 100 men, or 0.5%
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