Where does your memory live? Your personality? Your career? Your soul? These are questions usually relegated to late-night conversations in dorm rooms or talk radio, or else for academics well versed in philosophy, neurology or even religion. Even when they feel more crucial to our lives, as when a loved one is dying or faces dementia, we often find ourselves speculating uselessly. But for Jon Sarkin, once a successful chiropractor, and his wife, Kim, these questions were literally life and death after a blood vessel misfired in his brain.
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