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Molecular Origami. Precision Scale Models from Paper. ROBERT M. HANSON. University Science, Sausalito, CA, 1995. xvi, 223 pp., illus. Paper, $22.
Chemical structures have to be understood in three dimensions, yet books and blackboards are in two, so chemistry classrooms and labs are often decorated with molecular models made of plastic, styrofoam, and the like. Many students purchase modeling kits that allow structures with "standard" bond lengths and angles to be constructed. Trickier structures, such as ones with fivefold symmetry or unusual bond lengths, can be difficult...