"What Sex Really Means" is the intriguing title of a talk to be given next Wednesday by Prof Steve Jones at the Galton Laboratory, University College, London. He has written books and presented radio lectures on genetics and evolution and is in Dublin as a guest of Trinity College's Genetical Society. Prof Jones's seminar is at 8 p.m. on Wednesday, May 12th, in the Walton Theatre in Trinity's Arts block.