What, in life, is "natural"? People talk about natural learning, and natural foods, and natural instincts. Human "nature." It's all words.
Are words natural? Where's the edge of "natural"?
Recently I've read that it might be that all the heavy metals are here from meteors and meteorites. If they're not from this planet, are the "natural"? But aren't meteors natural?
Is this too simple a question? Too complex?
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