
(FILES) This file photo taken on October 8, 2009 shows Ahmad Zewail, Egypt-born US 1999 Nobel Chemistry laureate attending press conference before the Nobel Laureates Seminar in Vienna. Nobel prize-winning Egyptian chemist Ahmad 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 / SAMUEL KUBANISAMUEL KUBANI/AFP/Getty Images


