OK, sports fans. The contenders are using the word "falsifiable" in the sense of "disprovable by conceivable evidence that might in theory be discovered."

Karl Popper believed that a scientific theory had to be potentially disprovable. Any claim expressed in a way that could never be disproved by reason wasn't scientific. Like, "The jet-propelled unicorn I see is there, but your inferior brain just won't let you see her." Try and prove that wrong.

Despite what some of you are thinking, "falsifiable" doesn't mean scientists can fake it if they want to.

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