A handout picture released on August 7, 2016 by the Egyptian Presidency shows Egyptian President Abdel Fattah al-Sisi (C) walking with officials and relatives of prize-winning Egyptian-American chemist Ahmed Zewail, during his official funeral procession in Cairo. Nobel prize-winning chemist Ahmed Zewail received a funeral with military honours attended by Egypt's president and top state officials Sunday in Cairo. Zewail, who served as a science and technology advisor to US President Barack Obama, died Tuesday in the United States. He was 70. / AFP PHOTO / EGYPTIAN PRESIDENCY / HO / = RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO/HO/ EGYPTIAN PRESIDENCY" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS == HO/AFP/Getty Images
