Anderson Cooper is signing off after 20 years.The CNN anchor, 58, bid farewell to "60 Minutes" on the newsmagazine show's May 17 episode, his last as a correspondent. After the season finale, which featured a report by Cooper about London's cab industry in the age of autonomous vehicles, CBS News released an extended farewell interview with the journalist.Cooper grew emotional as he delivered his final "I'm Anderson Cooper." After choking up for several seconds and looking down as he held back tears, he looked straight into the camera and said the line three times, a standard for the show.In the...