Martin Karplus speaks to the press after winning the 2013 Nobel Prize for chemistry in Cambridge, Massachusetts, October 9, 2013. Karplus, Michael Levitt and Arieh Warshel won the Nobel chemistry prize on Wednesday for pioneering work on computer programs that simulate complex chemical processes and have revolutionized research in areas from drugs to solar energy. REUTERS/Dominick Reuter (UNITED STATES - Tags: SCIENCE TECHNOLOGY)