"One day we shall certainly 'reduce' thought experimentally to molecular and chemical motions in the brain; but does that exhaust the essence of thought?"

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The vitamin has been reified. A chemical intangible originally defined as a unit of nutritive value, it was long ago reified into a pill. Now it is a pill; no one except a few precise scientists define it as anything else. Once the vitamin became a pill, it became real according to the precepts of American Cartesianism: I swallow it, therefore it is.

— Florence King