Scientists find hints of dark matter at the bottom of a mine

Scientists searching for evidence of the existence of dark matter, the hypothetical matter theorized to account for the majority of the observable universe's mass, have found vague but intriguing clues at the bottom of a Minnesotan mine:

An international team of physicists working in the bottom of an old iron mine in Minnesota said Thursday that they might have registered the first faint hints of a ghostly sea of subatomic particles known as dark matter long thought to permeate the cosmos.

The particles showed as two tiny pulses of heat deposited over the course of two years in chunks of germanium and silicon that had been cooled to a temperature near absolute zero. But, the scientists said, there was more than a 20 percent chance that the pulses were caused by fluctuations in the background radioactivity of their cavern, so the results were tantalizing, but not definitive.

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