File - In this, Aug. 14, 2015 photo, Egyptian-American Nobel chemistry laureate Ahmed Zewail speaks to a group of journalists at his home in Cairo, Egypt. (AP Photo/Amr Nabil)
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Ahmed Zewail, a science adviser to President Obama who won the 1999 Nobel prize for his work on the study of chemical reactions over immensely short time scales, died Tuesday.Egyptian media reported that it was in the United States.Over nearly 40 years at Caltech, Zewail and his students pioneered the field of femtochemistry, the use of lasers to monitor chemical reactions at a scale of a femtosecond, or a millionth of a billionth of a second.Zewail authored some 600 scientific articles and 16 books and was showered with honors from around the world, including France's highest honor, the Legion d'Honneur, and Egypt's Order of the Grand Collar of the Nile.In 2009, the president named Zewail, a naturalized citizen, to the Council of Advisors on Science and Technology and later that year made him the first U.S. science envoy to the Middle East.
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