Karl Popper
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Sir Karl Popper (1902-1994) was an insightful Austrian-born philosopher who had an influence on science. Popper observed that science should only include a theory that is "falsifiable", which means capable of being proven false if it is false. Popper wrote that "the scientific status of a theory is its falsifiability, or refutability, or testability."[1]
An example of a theory that is not falsifiable is the claim that black holes exist. If that claim were false, there is no way to prove that it is false. According to Popper's theory, a claim that black holes exist is not really science. However, Popper himself seemed reluctant to apply his own philosophy to the theory of general relavitity.
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