European dairy farmers spray police officers with milk during a demonstration outside the European Parliament in Brussels on Monday.
Geert Vanden Wijngaert/AP
November 28, 2012 Our complicated relationship with milk may make images of this week's EU dairy farmers' protest more powerful than, say, if they sprayed police with water. For much of human history, says historian Deborah Valenze, we've wavered between reverence and revulsion for the stuff.
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