Scientific knowledge is in perpetual evolution it finds itself changed from one day to the next.
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About Jean Piaget
Jean Piaget was a 19th-century Swiss psychologist. Jean William Fritz Piaget (, ; French: [ʒɑ̃ pjaʒɛ]; was a Swiss psychologist known for his work on child development. Piaget's theory of cognitive development and epistemological view are together called genetic epistemology. Read more on Wikipedia →