On this week's "60 Minutes," judges say it's time for more security in the face of mounting violence. Bill Whitaker reports. Six years after our initial report, Lesley Stahl visits surviving members of the 90+ Study and finds out what scientists have learned from following the study's participants. And Jon Wertheim interviews pianist Igor Levit.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.