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Anderson Cooper hears from Sandy and Lonnie Phillips -- who lost their daughter in 2012's Aurora shooting. They now travel the country helping those who also lost loved ones at the hands of a gunmen. Bill Whitaker reports on a groundbreaking experiment -- being performed on inmates at Connecticut's Cheshire Correctional Institution. With Arctic permafrost thawing too quickly, scientists in Siberia are considering drastic measures. Scott Pelley has the story on tonight's "60 Minutes." Learn more about your ad choices. Visit megaphone.fm/adchoices See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.