I saw the program (it was a re-run). There were young people on the show so I believe a person is born with it and it doesn't just evolve. THOUGH with one exception...a woman had had a seizure and it was found she needed brain surgery. When she was recovering in the hospital she had developed this condition. The doctors don't know why!
It would be a horrible thing to have as you'd NEVER really recognize those folks close to you. Plus how would you fall in love? It would be like meeting for the first time, EVERY time!!!
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