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Violence is usually seen as some sort of moral failing. Gary Slutkin says we should instead treat it like a disease. As anyone who\\u2019s left a Hershey\\u2019s bar too long in their pocket can tell you\\u2026 chocolate melts pretty easily. A scientist has uncovered the gene that could change that. The shape and form of the book hasn\\u2019t changed all that much since the Middle Ages. But it has definitely changed us.