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A gross estimate of the neutron skin [0.80(5)(N − Z)/A fm] is extracted from experimental proton radii, represented by a four parameter fit, and observed mirror displacement energies (CDE). The calculation of the latter relies on an accurately derived Coulomb energy and smooth averages of the charge symmetry breaking potentials constrained to state of the art values. The only free parameter is the neutron skin itself. The Nolen Schiffer anomaly is reduced to small deviations (rms=127 keV) that exhibit a secular trend. It is argued that with state of the art shell model calculations the anomaly should disappear. Highly accurate fits to proton radii emerge as a fringe benefit. Recent experiments [1,2] have considerably added to our knowledge of neutron radii, the most elusive of the fundamental properties of nuclear ground states. The two sets of measures are consistent with one another, and a recognizable pattern emerges [1, Fig. 4], leading to an estimate for the neutron skin (ν ≡ neutrons, π ≡ protons, t = N − Z)A third-totally different-experiment [3] adds weight to this estimate: it deals with the sodium isotopes, lighter and far more exotic than the species studied in [1,2]. Nonetheless, their ∆ rνπ behaviour is very much the same, as seen in Fig. 1.

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