LONDON, UNITED KINGDOM - SEPTEMBER 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge greet Professor Dame Jean Thomas (Vice President of The Royal Society) and Professor John Pethica (Vice President of The Royal Society) as they arrive to attend the Tusk Conservation Awards at The Royal Society on September 12, 2013 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
