By Walter Gander, Jiri Hrebicek, J. Hebiek
By Frank Y. Wang (LaGuardia College, NY)
By Richard H. Enns, George C. McGuire
By W. Bernard Carlson
By Denis Brian
By Roger Penrose
By Walter Isaacson
By Kai Bird, Martin J. Sherwin
By Close, F.E.
By Christophe Galfard
By John W. Arthur
By Eugene Paul Wigner, Andrew Szanton
By Al-Khalili, Jim
By Richard P. Feynman
By Lui Lam (San Jose State Univ, USA)
By Lawrence M. Krauss
By Richard P Feynman
By Alan C. Newell
By Michel Remoissenet
By Lui Lam
By John Gribbin, Mary Gribbin
By John D. Barrow
By Walter J. Moore
By Edward Speyer
By Ralph Leighton
By Christopher Sykes
By Hans Albrecht Bethe
By Fritz Rohrlich (Syracuse University, New York)
By Arthur W. Wiggins
By Adam Becker