What does it mean to know something?

John Marzillier, psychologist and writer, reviews Jerome Kagan's 'On Being Human: Why Mind Matters'.

George Orwell suggested that a writer often writes out of the ‘desire to see things as they are, to find out true facts and store them up for the use of posterity’. This collection of 12 essays by the distinguished social scientist Jerome Kagan bears out Orwell’s observation. Citing another famous essayist, Montaigne, who was preoccupied with the question ‘What do I know?’, Kagan asked himself a slightly different question: What does it mean to know something? Drawing upon his prodigious


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