Martin Karplus, Michael Levitt and Arieh Warshel jointly won the
Nobel Prize in chemistry for their work in the development of
multiscale models for complex chemical systems. Photo: Getty
Images  Three U.S.-based scientists who pioneered the use of
computers to probe complex chemical reactions—revolutionizing
the design of new drugs and streamlining industrial
research—were awarded the 2013 Nobel Prize in chemistry on
Wednesday.   The Nobel committee awoke Dr. Warshel at 3 a.m. in
Los Angeles with the news. Asked by the committee how he felt
about the award, the newly minted Nobel laureate replied,
"Extremely well."   Nobel Prize Winners  Read more about the
2013 laureates.  By Country, University   Announcing the award
in Stockholm, Staffan Normark, permanent secretary of the Royal
Swedish Academy of Sciences, said, "This year's prize is about
taking the chemical experiment to cyberspace."  At its simplest,
the computational techniques the three pioneered—working out
their first ideas on a vintage Harvard su