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In page Émile Zola:

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The optimist is that other face of the scientific experimenter, the man with an unshakable belief in human progress.[citation needed] Zola bases his optimism on innéité and on the supposed capacity of the human race to make progress in a moral sense. Innéité is defined by Zola as that process in which "se confondent les caractères physiques et moraux des parents, sans que rien d'eux semble s'y retrouver";[5] it is the term used in biology to describe the process whereby the moral and temperamental dispositions of some individuals are unaffected by the hereditary transmission of genetic characteristics. Jean Macquart and Pascal Rougon are two instances of individuals liberated from the blemishes of their ancestors by the operation of the process of innéité.[citation needed]