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Put in the standard trivial example. Also, I think "prove it false if it were false" is overthinking it.
A proposition or theory is '''falsifiable''' when it is hypothetically possible for an experiment to prove it false if it were false.<ref>[http://www.encyclopedia.com/doc/1O87-falsifiability.html Definition] A Dictionary of Psychology, Andrew M. Colman, via encyclopedia.com</ref> A proposal or theory that can never be shown to be false with any hypothetical experiment is not falsifiable.
A proposition or theory is '''falsifiable''' if it is hypothetically possible to conduct an experiment that proves it false.<ref>[http://www.encyclopedia.com/doc/1O87-falsifiability.html Definition] A Dictionary of Psychology, Andrew M. Colman, via encyclopedia.com</ref> A proposal or theory that can never be shown to be false with any hypothetical experiment is not falsifiable.
As an incredibly simple example, it is a generally accepted scientific principle that dropped objects fall downward. (Ignore various issues about imparting initial upward velocity, that is, throwing the object, or unusual frames of reference, like centrifuges.) But it is possible to visualize what it would look like if one dropped an object and it fell upward. Therefore, the theory that dropped objects fall downward is falsifiable.
To be considered [[scientific]], a [[hypothesis]] must be "[[falsifiable]]", i.e., capable of being proven false. If no one, not even the supporters of the hypothesis, can think of a way the hypothesis might be proven false, then most scientists would agree that it is not part of science (see [[pseudoscience]]). However, the [[history of science]] is full of examples whereby supporters of various theories refused to consider the prospect that someone might prove them wrong.
To be considered [[scientific]], a [[hypothesis]] must be "[[falsifiable]]", i.e., capable of being proven false. If no one, not even the supporters of the hypothesis, can think of a way the hypothesis might be proven false, then most scientists would agree that it is not part of science (see [[pseudoscience]]). However, the [[history of science]] is full of examples whereby supporters of various theories refused to consider the prospect that someone might prove them wrong.