To prove something doesn’t exist you need to know everything there possibly is to know about the universe, which is impossible.
If I have a warehouse the size of Texas full of white balls and 1 black ball, you can easily prove that there are white balls in there by… opening your eyes. You can’t prove there are no black balls unless you know the color of every single ball (either because I told you, or you physically checked all 90 billion balls).
Proving a positive requires knowing the positive thing
Proving a negative requires you to know EVERYTHING.
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