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Για ένα πολύ μεγάλο διάστημα, από τα μεταπολεμικά χρόνια μέχρι και το τέλος της δεκαετίας του ’90, ο μέσος δείκτης ευφυίας του παγκόσμιου πληθυσμού φαινόταν να αυξάνεται. Παρ’ όλα αυτά οι τελευταίες μετρήσεις σε ανεπτυγμένες χώρες δείχνουν αντιστροφή του φαινομένου, σαν ξαφνικά να έπιασε «ταβάνι» η νοημοσύνη του ανθρώπινου είδους …
