For their colleagues, and for graduate students, over 120 professional scientists and engineers in physics, chemistry, materials science, solid state electronics, and other fields from around the world describe research findings regarding the exciting high-temperature superconducting material announced at the beginning of 2001. They discuss the basic physical properties of pellets and wires of the polycrystalline form, complex behavior, a model of anisotropic s-wave superconductivity, electronic and structural properties, electrodynamics, specific heat in the normal and superconducting state, and other topics. Annotation c. Book News, Inc., Portland, OR (booknews.com)