IBM researchers are counting on a 40-year-old technology to keep modern, state-of-the-art data centers running cool and allow companies to squeeze more computing power from the electricity they consume. At the data-center level, Roger Schmidt, chief thermal architect and distinguished engineer at IBM's server and workstation division sees <A HREF="http://www.cio.com/blog_view.html?CID=28599">an expanded role for water cooling</A> as a means to bring heat levels down. Water cooling, which uses small pipes filled with distilled or deionized water to dissipate heat, was first used by IBM to cool mainframe computers during the 1960s.