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HEIDELBERG, GERMANY - JULY 20: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, accompanied by Baden-Wurttemberg's Minister President Winfried Kretschmann (Alliance '90/Greens) and his wife Gerlinde, listen to Dr. Michael Milsom during a visit to the German Cancer Research Institute on day 2 of their official visit to Germany on July 20, 2017 in Heidelberg, Germany. (Photo by Marijan Murat - DPA Pool/Getty Images)