Stanford University professor Michael Levitt, who won the Nobel Prize in chemistry, speaks during an interview at his home Wednesday, Oct. 9, 2013, in Stanford, Calif. Three U.S.-based scientists won ... more 
Stanford University professor Michael Levitt, who won the Nobel Prize in chemistry, speaks during an interview at his home Wednesday, Oct. 9, 2013, in Stanford, Calif. Three U.S.-based scientists won this year's Nobel Prize in chemistry for developing powerful computer models that researchers use to understand complex chemical interactions and create new drugs. Research in the 1970s by Levitt, Martin Karplus and Arieh Warshel led to programs that unveil chemical processes such as how exhaust fumes are purified or how photosynthesis takes place in green leaves. (AP Photo/Eric Risberg) less 
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Associated Press | Photo By Eric Risberg
Wed, Oct 9, 2013 11:01 AM EDT