1999 : WHAT IS THE MOST IMPORTANT INVENTION IN THE PAST TWO THOUSAND YEA

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Emeritus Professor of Psychology, London School of Economics; Visiting Professor of Philosophy, New College of the Humanities; Senior Member, Darwin College, Cambridge; Author, Soul Dust
theoretical psychologist

The most important invention has been reading-glasses. They have effectively doubled the active life of everyone who reads or does fine work — and prevented the world being ruled by people under forty