Predictions of the Yukawa potential are reviewed. It is pointed out that the potential leads to qualitative, but not quantitative, agreement with two-nucleon experiments at low energy. The agreement can be made quantitative by making modifications of the Yukawa potential at internucleon separations smaller than 12 the Compton wavelength of the π meson. This result is illustrated with specific examples of modified potentials. The significance of these potentials is discussed.

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