By Renato Dulbecco (The Salk Institute, La Jolla, California, U.S.A.)
By C. Grundsten, Peter Hanneberg
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By Marthe Kiley-Worthington
By Barnes, Simon, Simon Barnes
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By Brickell, Christopher
By Michael Hanlon, Arthur C. Clarke
By Anthony Foottit, Pat Albeck
By McEvoy, J.P., Zarate, Oscar
By Keith Chivers, HRH Prince Philip
By Stephen Hawking (University of Cambridge)
By Susanna Bailey
By Jason Wilson
By James Herriot
By Professor Jay M Pasachoff (Williams College Massachusetts), Roger Tory Peterson
By Cathy Wright, Harry Ricketts, Grant Bradford
By Mackean, D. G., D. G. Mackean
By The Met Office
By DK
By PETER MESSENT
By David Reid-Henry
By Susan Finden
By Sarah Martin
By Ian Ridpath, Wil Tirion
By Wade Davis