When a child asks "Why is the sky blue?" They're really asking how light is reflected in the air to make it appear as blue. A "why" question doesn't make sense because purpose and intention have nothing to do with it. It's tautological, a mechanical series of steps.
Nowadays, as I learn about evolution, it's amazing how it explains how life works... strangely enough, it also implies "why" in some instances. Darwin, by saying an animal is motivated to survive to pass on genes, is technically assuming an animal's intention - "why" they are doing something, not just "how". (I guess I'm accustomed to science answering tautological questions - whenever something dealing with "why" comes up in science there's a controversy).
Anyway, there's a difference between the way a kid asks questions and the way a scientist does - i'll take guesses about why!
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