The aftermath of another U.S. school slaying, and a small Connecticut town searches for answers about how it could have happened. No-one knows what drove Adam Lanza to kill 26 people, including 20 children and his own mother, but mental illness may prove to be a factor. According to neuroscientists, clues may lie in the structure of his brain. They say that studies of MRI scans of the brains of violent criminals show structural abnormalities that are not found in the brains of normal people.
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