A heroic investigation at Berkeley has shown that mica of good quality can be used to search for evidence of one possible component of the missing mass required to close the Universe; none has been found so far.
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Maddox, J. Particle physics in slivers of mica. Nature 375, 355 (1995). https://doi.org/10.1038/375355a0
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DOI: https://doi.org/10.1038/375355a0