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HOW do you know who you are? Will you still be the same person tomorrow? How about in 30 years’ time? In a lifetime the brain squirrels away a vast stash of facts, names, faces, sights, sounds and smells, records scores of events and their associated emotions, and helps us acquire countless skills, from tying shoelaces to making popcorn to driving a car. All these memories define who we are. They shape our personalities, anchor us in time and give us a sense of reality. And somehow, even though the molecules from which our brains are built are replaced many times in a lifetime, our memories…