"The fact, however, to which I want to call attention is that the master of Judo never relies upon his own strength. He scarcely uses his own strength in the greatest emergency. Then what does he use? Simply the strength of his antagonist. The force of the enemy is the only means by which that enemy is overcome."

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So my antagonist said, "Is it impossible that there are flying saucers? Can you prove that it's impossible?" "No," I said, "I can't prove it's impossible. It's just very unlikely." At that he said, "You are very unscientific. If you can't prove it impossible then how can you say that it's unlikely?" But that is the way that is scientific. It is scientific only to say what is more likely and what less likely, and not to be proving all the time the possible and impossible.

— Richard P. Feynman