I used to ask the question in biology class: why do we eat? The logical and most common answer, of course, was “because we get hungry.” “But why do we get hungry” I asked them back? “Because our stomachs are empty.” You get the picture. And it went around like this until students understood that when they said “I’m hungry, I’m thirsty, I’m tired…” they were at bottom, making statements about the conditions of their cells. And I would from there go on to describe the universal …

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