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A proposition or theory is '''falsifiable''' if it is [[valid argument|logically valid]], regardless of soundness.<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 is not falsifiable.

A proposition or theory is '''falsifiable''' if it is [[valid argument|logically invalid]], regardless of soundness.<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 is not 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. Supporters of the [[evolution]] and [[global warming]] theories are like this.  

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. Supporters of the [[evolution]] and [[global warming]] theories are like this.