PASADENA, Calif. (AP) — Ahmed Zewail, a science adviser to President Barack Obama who won the 1999 Nobel Prize for his work on the study of chemical reactions over immensely short time scales, has ...

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Tens of thousands of anti-government protesters poured into the streets of Egypt Friday, stoning and confronting police who fired back with rubber bullets and tear gas in the most violent and chaotic ...

CAIRO (Reuters) - Nobel Prize-winning Egyptian-American chemist Ahmed Zewail, a science and technology advisor to President Barack Obama and the first U.S. science envoy to the Middle East, died on ...