MIT team achieves coldest temperature ever

MIT team achieves coldest temperature ever: "CAMBRIDGE, Mass. -- MIT scientists have cooled a sodium gas to the lowest temperature ever recorded -- only half-a-billionth of a degree above absolute zero. The work, to be reported in the Sept. 12 issue of Science, bests the previous record by a factor of six, and is the first time that a gas was cooled below 1 nanokelvin (one-billionth of a degree)."