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PHILOSOPHY Philosophy of Science Falsifiability

Falsifiability

Falsifiability defines scientific theories by their capacity to be disproven through observation

9 Nov 2025

Why did Karl Popper argue that falsifiability, rather than verifiability, is the key criterion for scientific theories?

Because a theory can never be conclusively verified by all possible observations, but a single contradictory observation can falsify it. Because verifying a theory requires complex experiments that are often impractical to perform. Because falsifiability allows scientists to prove theories true through repeated testing.