
This file photo taken on September 11, 2012 shows US-Egyptian Nobel prize-winning scientist Ahmed Zewail addressing members of the constitution committee at the Shura council in Cairo. Nobel prize-winning Egyptian chemist Zewail, who served as a science and technology advisor to US President Barack Obama, died on August 2, 2016 in the United States at the age of 70, Egypt's presidency announced. / AFP PHOTO / KHALED DESOUKIKHALED DESOUKI/AFP/Getty Images


