"Cities are responsible for the vast majority of the creation of the economy. They're also places into which we pour the vast majority of resources, the vast majority of energy and the places where a huge percentage of the decisions about how systems are built and how products designed, etc., happen."

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Colin did not laugh. Instead he thought, Tampons have strings? Why? Of all the major human mysteries - God, the nature of the universe, etc. - he knew the least about tampons. To Colin, tampons were a little bit like grizzly bears: he was aware of their existence, but he'd never seen on in the wild, and didn't really care to.

— John Green