According to Kuhn, by the time a child reaches adolescence there is considerable variability in cognitive functioning across individuals
He was a philosopher of science whose was influential in both academic and popular circles; he introduced the term paradigm shift which has since become an English-language idiom.
He has argued that science does not evolve gradually towards truth, rather, it has a paradigm which remains constant before going through a paradigm shift when current theories can't explain some phenomenon, and someone proposes a new theory.
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