can something come ex nihilo (out of nothing) unless someone or something made it, from any standpoint (scientific or philosophical)
Have you ever made something out of nothing? Have you ever seen anyone do it, or heard of anyone doing it? I sure haven't. Why then do you think it takes somebody doing something to get something out of nothing, given that we've never seen anyone be able to do it?
If you can get something out of nothing, the
last process I'd suspect of being capable of it would be intelligent action.
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