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RE: "You cannot prove a negative". Really?
If you limit the search to your garage, it's easy to say if the elephant is there or not.
But I think that for other problems it may be a little harder to decide.
EDIT consider subatomic particles, psychic phenomena, parallel universes etc
So in fact you can prove a negative, but in some cases it can be harder than in others.
I think that every truth and proof we may reach as humans is always limited and temporary. We rely on five senses or scientific tools but we always must be ready to revise our conclusions when incoming new data and technology arrive