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1911 in science
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==Psychology== * The [[Ponzo illusion]], a [[geometrical-optical illusion]], is first demonstrated by Italian psychologist [[Mario Ponzo]].<ref>{{cite journal|first=M.|last=Ponzo|title=Intorno ad alcune illusioni nel campo delle sensazioni tattili sull'illusione di Aristotele e fenomeni analoghi|journal=Archives Italiennes de Biologie|year=1911}}</ref>
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