Pain is a "hallmark of consciousness among all beings," writes physician Haider Warraich in his new book "The Song of Our Scars." Pain, he explains, is also gendered, racial and above all so personal that it's the one thing truly our own. Like an estimated 1.5 billion people worldwide, Warraich himself lives with chronic pain, brought on by a devastating back injury. We'll talk to Warraich about the biology of pain and how we experience what he calls our most complicated sensation.
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