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Ahmed Zewail passed away in Los Angeles, California, United States, on August 2, 2016. He was 70 years old. Zewail was an Egyptian-American scientist who won the Nobel Prize in Chemistry in 1999 for his work on femtochemistry, the study of chemical reactions that take place in a millionth of a billionth of a second. Zewail was born in Damanhour, Egypt, in 1946.