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Falsifiability (or "refutability") is the logical possibility that an assertion can be shown false by an observation or a physical experiment. That something is "falsifiable" does not mean it is false; rather, that if it is false, then this can be shown by observation or experiment. Falsifiability is an important concept in science and the philosophy of science. The term "Testability" is related but more specific; it means that an assertion can be falsified through experimentation alone. Some philosophers and scientists, most notably Karl Popper, have asserted that a hypothesis, proposition, or theory is scientific only if it is falsifiable. Not all statements that are falsifiable in principle are falsifiable in practice. For example, "it will be raining here in one million years" is theoretically falsifiable, but not practically. On the other hand, a statement like "there exist parallel universes which cannot interact with our universe" is not falsifiable even in principle; there is no way to test whether such a universe does or does not exist. In work beginning in the 1930s, Popper gave falsifiability a renewed emphasis as a criterion of empirical statements in science.
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