Introduction

We used to believe that memories were made in our hearts. Then we discovered the brilliant brain, and the last few centuries have been spent trying to understand what’s going on between our ears. But memory’s on the move again. The more we try to pin it down, the more elusive it becomes. And I don’t know about you but a great deal of my memory is now definitely in my back pocket.

Inside my mobile phone I have all the numbers I use regularly, plus access to online directories that let me track down anyone else I might need to call. The internet provides me with more information than I will ever have time to use, accessible wherever I am in the world. My phone itself holds lists of jobs to do, calendars full of important birthdays, ...

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