By ISAAC ASIMOV
By Edward Lawrence Levy
By D.A. Rayner
By Brian Aldiss, Harry Harrison
By Mary Hemingway
By Adrian J. Desmond
By Orson Scott Card
By George Zebrowski
By Alan Dean Foster
By Robert Silverberg
By John Varley
By Jef Geeraerts, J. Swan
By Ernest Forbes
By Tim Jeal
By Harold C. Schonberg
By Dave Allen
By Kenneth Williams
By Henry Denker
By Joyce Verrette
By Barry Norman
By Nicola Schaefer
By Robin Lane Fox (Reader in Ancient History at Oxford University and a Fellow of New College)
By Derek Lambert
By Paul Johnson
By Robert Baldwin, Ruth Paris
By Graham Hewitt
By H.P.K. Oram
By Roger Eglin, Berry Ritchie
By Oliver Grape