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“The last scan in the pile was strikingly odd. In fact it looked exactly like the most abnormal of the scans I had just been writing about, suggesting that the poor individual it belonged to was a psychopath—or at least shared an uncomfortable amount of traits with one....When I found out who the scan belonged to, I had to believe there was a mistake....But there had been no mistake. The scan was mine.” For the first fifty-eight years of his life James Fallon was by all appearances a normal guy. A successful neuroscientist and medical school professor, he’d been raised in a loving, supportive family, married his high school sweetheart, and had three kids and lots of friends. Then he learned a shocking truth that would not only disrupt his personal and professional life, but would lead him to question the very nature of his own identity.