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Much of the history of the city can be written as a tension between the visible and the invisible. What and who gets seen? By whom? Who interprets the city’s meaning?
Where does sad music get its sadness from? A widely accepted notion is that the interval of a minor third—two pitches separated by one full tone and one semi-tone—conveys sadness.
Some economists have suggested adjusting the supply-and-demand problem through market incentives. Instead of asking people to donate their organs, why not just pay for them?