Falsifability Statements that belong in science must be about reproducible observations. However, as Karl Popper pointed out, there is a much stricter requirement. Such a statement is said to be falsifiable. Notice that a falsifiable statement is not automatically wrong. However a falsifiable statement always remains tentative and open to the possibility that it is wrong. When a falsifiable statement turns out to be a mistake, we have a way to detect that mistake and correct it. Examples of non falsifiable statements An alien spaceship crashed in Roswell New Mexico. A giant white gorilla lives in the Himalayan Mountains. Loch Ness contains a giant reptile. Examples of falsifiable statements No alien spaceships have ever landed in Roswell New Mexico. This critter (just pulled from Loch Ness) is a fish. How to tell if something is falsifiable In most cases a falsifiable statement just needs one observation to disprove it. A Statement that is not falsifiable usually needs some sort of exhaustive search of all possibilities to disprove it
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