Sunday, July 30, 2006

Concrete, The Rock of Civilization

In one Dr Who episode The Tardis lands back on Skaro years after the Thal-Kaled war. The Doctor remarks that the rock around them is the rarest in the universe, concrete.

On NPR is discussion about safety and concrete in relation some rexent failures at Boston's "Big Dig". The Calvin and Hobbes explanation for figuring out bridge load limits was suggested. Oddly the roundtable of civil engineers were more hesitant in supposing that there is some sort of engineering perfection. The Uncertainty of the engineering professionals was reassuring.
How do they know the load limit on bridges Dad? They drive bigger and bigger trucks over the bridge until it breaks. Then they weigh the last truck and rebuild the bridge. Oh. I should've guessed. Dear, if you don't know the answer. Just tell him
Calvin and Hobbes 26-11-86

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