Six years of the fifth force

@article{Fischbach1992SixYO,
  title={Six years of the fifth force},
  author={E. Fischbach and C. Talmadge},
  journal={Nature},
  year={1992},
  volume={356},
  pages={207-215}
}
The enunciation of the 'fifth force' hypothesis in 1986 spawned a generation of experiments searching for deviations from newtonian gravity. Although no compelling evidence for any new weak forces has emerged in the past six years, the searches for anomalous gravitational effects have produced a large number of important experimental and theoretical results. 
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