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High-temperature superconductors are nowadays found in great variety and holdtechnological promise. It is still an unsolved mystery that the criticaltemperature T_c of the basic cuprates is so high. The answer might well behidden in a conventional corner of theoretical physics, overlooked in therecent hunt for exotic explanations of new effects in these materials. Aforgotten intra-atomic s-d two-electron exchange in the Cu atom is found toprovide a strong (~eV) electron pairing interaction. ABardeen-Cooper-Schrieffer approach can explain the main experimentalobservations and predict the correct d_{x^2-y^2} symmetry of the gap.Comment: 4 pages, 3 figures, LaTeX2

THE 3d-TO-4s-BY-2p HIGHWAY TO SUPERCONDUCTIVITY IN CUPRATES