Deep inside an idle iron mine, below the ancient hematite rock formations of northern Minnesota, a tiny elevator rattles to a halt on Level 27. Here among dozing bats and artificial lights, people wait. And wait. This is the unlikely site of the Cryogenic Dark Matter Search (CDMS II) lab, where scientists are looking for the tiny burst that will indicate evidence of dark matter, a product of the big bang believed to comprise 25% of the material in the universe. Observations of visible structures in space suggest that their own gravitational forces are not strong enough to account for their formation, suggesting some kind of missing mass is responsible. This missing mass is believed to be dark matter, so called because it does not emit or scatter light like ordinary matter.
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