FILE- In this 2005 file photo, Scientist George Cowan addresses a Los Alamos National Laboratory colloquium, in Los Alamos, New Mexico. Cowan worked at Los Alamos National Laboratory for nearly 40 ... more 
FILE- In this 2005 file photo, Scientist George Cowan addresses a Los Alamos National Laboratory colloquium, in Los Alamos, New Mexico. Cowan worked at Los Alamos National Laboratory for nearly 40 years. He started in 1949 as a scientist and went on to serve as a director of chemistry and as associate lab director of research. Cowan was a chemist whose influence touched everything from the Manhattan Project and the hunt for evidence of the Soviet Union's first nuclear tests to the Santa Fe Institute and the iconic Santa Fe Opera. Cowan died Friday, April 20, 2012 at his home in Los Alamos, New Mexico. He was 92. (AP Photo/Los Alamos National Laboratory, File) less 
1 / 29
Associated Press | Photo By Los Alamos National Laboratory, File
Fri, Apr 20, 2012 9:46 PM EDT