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Scott Pelley interviews an undercover FBI operative -- who details how he infiltrated al Qaeda and thwarted terror attacks planned for New York and Toronto. Are zookeepers playing God? Lesley Stahl reports 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.