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More from parents of Newtown victims

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Newtown parents offer thanks

Jimmy Greene, Francine Wheeler and David Wheeler say the outpouring of support they got from the public helped them go on after the shooting that took their children's lives.

More from parents of Newtown victims

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Understanding autism and mental illness

Nicole Hockley, whose son Dylan had autism, tells Scott Pelley that people who have the behavioral disorder are not prone to violence.

More from parents of Newtown victims

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Preventing another Adam Lanza

Nelba Marquez-Greene, whose daughter Ana was killed in the Sandy Hook shooting, describes an innovative idea for identifying children like Adam Lanza who are isolated in school.