Physics: The waiting game

@article{Brumfiel2004PhysicsTW,
  title={Physics: The waiting game},
  author={Geoff Brumfiel},
  journal={Nature},
  year={2004},
  volume={429},
  pages={10-11}
}
A few physicists have spent decades searching for the rarest events in the Universe — and seen nothing. But their enthusiasm for the hunt is undimmed. Geoff Brumfiel asks what keeps them going. 
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