We are so impressed by scientific clank that we feel we ought not to say that the sunflower turns because it knows where the sun is. It is almost second nature to us to prefer explanations . . . with a large vocabulary. We are much more comfortable when we are assured that the sunflower turns because it is heliotropic. The trouble with that kind of talk is that it tempts us to think that we know what the sunflower is up to. But we don't. The sunflower is a mystery, just as every single thing in the universe is.
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