HAMBURG, GERMANY - JULY 21: First Mayor of Hamburg Olaf Scholz (L) and Museum director Peter Tamm (2nd-R) give Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge a tour of the Internationales Maritimes Museum Hamburg to celebrate the joint UK-German year of science, which for 2017 is focused on oceans, during day three of their official visit to Germany after two days in Poland on July 21, 2017 in Hamburg, Germany. (Photo by Michael Ukas - Pool/Getty Images)
