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smoothmoniker has hit the nail on the head. On the other hand, in a practical sense everyone accepts negatives as being proven at some point. I suspect very few of us are sitting on the fence about the existence of magic unicorns; they don't exist. There is just always the ever-present caveat that if you can prove magic unicorns do exist then we will chance our minds. Have we the ability to examine the entire solar system for unicorns? No, but we are still comfortable saying there are none.
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