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#224
6 years ago
Eiffel designed the structure for his tower based on the inside of human bone. In studying the strength of the femur, he saw the honeycomb shape helped to disperse pressure. That's why the metal bracing of the tower has that setup. Slight Smile
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#225
6 years ago
The Hoover Dam was finished in 1935. Concrete in the core is still curing.
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#226
5 years ago
Every year motorists spend about 3.7 billion hours waiting in gridlocked traffic. The average U.S. worker earned about $24.5 per hour in 2012, so the implicit opportunity cost of all those hours spent in traffic is around $91 billion per year. Thus the annual total social cost of U.S. traffic gridlock is more than $97 billion.
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