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Ultra-peripheral collisions of relativistic heavy ions involve long-rangedelectromagnetic interactions at impact parameters too large for hadronicinteractions to occur. The nuclear charges are large; with the coherentenhancement, the cross sections are also large. Many types of photonuclear andpurely electromagnetic interactions are possible. We present here anintroduction to ultra-peripheral collisions, and present four of the mostcompelling physics topics. This note developed from a discussion at a workshopon ``Electromagnetic Probes of Fundamental Physics,'' in Erice, Italy, Oct.16-21, 2001.Comment: 7 pages, with 3 figures. This developed from a discussion at the  workshop on "Electromagnetic Probes of Fundamental Physics," Oct. 16-21,  Erice, Ital

HOT TOPICS IN ULTRA-PERIPHERAL ION COLLISIONS