The great edifice of variety and choice that is an American supermarket turns out to rest on a remarkably narrow biological foundation comprised of a tiny group of plants that is dominated by a single species: Zea mays, the giant tropical grass most Americans know as corn.... There are forty-five thousand items in the average American supermarket and more than a quarter of them now contain corn.
M. Pollan, The omnivore's dilemma (2006), 18-19
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