He stands today as a beacon of universal values, peace and forgiveness and is recognized as one of the greatest leaders of our time. So says the United Nations Secretary General, Antonio Guterres, who along with actor and UN envoy, Forest Whitaker, headlined the official commemoration of Nelson Mandela International Day at the United Nations in New York. The UN's Postal Administration also unveiled a new Mandela postage stamp to mark the centenary of his birth. Sherwin Bryce-Pease reports.