Michael Levitt (R), a professor of structural biology at Stanford University, smiles with his wife Rina after a press conference in Stanford, California October 9, 2013. Three U.S. scientists, including Levitt, 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. The Royal Swedish Academy of Sciences, awarding the prize of 8 million crowns ($1.25 million) to Martin Karplus, Levitt and Arieh Warshel, said their work had effectively taken chemistry into cyberspace. REUTERS/Stephen Lam (UNITED STATES - Tags: SCIENCE TECHNOLOGY EDUCATION)