Relatives of Nobel prize-winning Egyptian-American chemist Ahmed Zewail march during the second part of his funeral procession at the Zewail City of Science and Technology in Cairo on August 7, 2016. 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 / KHALED DESOUKIKHALED DESOUKI/AFP/Getty Images

Dema Faham (C), the wife of Nobel prize-winning Egyptian-American chemist Ahmed Zewail, mourns during the second part of his funeral procession at the Zewail City of Science and Technology in Cairo on August 7, 2016. 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 / KHALED DESOUKIKHALED DESOUKI/AFP/Getty Images

Relatives of Nobel prize-winning Egyptian-American chemist Ahmed Zewail march during the second part of his funeral procession at the Zewail City of Science and Technology in Cairo on August 7, 2016. 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 / KHALED DESOUKIKHALED DESOUKI/AFP/Getty Images

Mourners attend the second part of the funeral procession of Nobel prize-winning Egyptian-American chemist Ahmed Zewail at the Zewail City of Science and Technology in Cairo on August 7, 2016. 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 / KHALED DESOUKIKHALED DESOUKI/AFP/Getty Images

Relatives of Nobel prize-winning Egyptian-American chemist Ahmed Zewail march during the second part of his funeral procession at the Zewail City of Science and Technology in Cairo on August 7, 2016. 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 / KHALED DESOUKIKHALED DESOUKI/AFP/Getty Images

Marcelo Odebrecht (R), the head of Latin America's largest engineering and construction company Odebrecht SA, and Otavio Marques Azevedo (L), CEO of Brazil's second largest builder Andrade Gutierrez, are escorted by federal police officers as they leave the Institute of Forensic Science in Curitiba, Brazil, June 20, 2015. REUTERS/Rodolfo Burher

(FILES): This file photo taken on April 29, 2016 shows Panamanian President Juan Carlos Varela (R), Nobel Memorial Prize in Economic Sciences, Joseph Stiglitz (C), and Swiss Professor of Criminal Law at Basel University, Mark Pieth (L), attending the presentation and inauguration of an independent committee of experts to review the Panamanian financial industry, in Panama City. Nobel-winning US economist Joseph Stiglitz and Swiss anti-corruption expert Mark Pieth said August 6, 2016 that a dispute over transparency had prompted them to quit a panel on reforming Panama's finance sector. The pair quit the committee -- set up by the Panamanian government in a declared bid to reform the country's tarnished financial services -- on August 5, 2016. / AFP PHOTO / RODRIGO ARANGUARODRIGO ARANGUA/AFP/Getty Images

TOPSHOT - Egyptian policemen look-out from a police vehicle parked during the arrival of the body of nobel prize-winning Egyptian-American chemist Ahmed Zewail, at Cairo airport on August 6, 2016. Zewail, who served as a science and technology advisor to US President Barack Obama, died on August 6, 2016 in the United States. He was 70. / AFP PHOTO / KHALED DESOUKIKHALED DESOUKI/AFP/Getty Images