By N.M.J. Woodhouse
By Martin W. McCall
By George Ellis, Ruth M. Williams
By Ian D. Lawrie (University of Leeds, UK)
By James J. Callahan, Jr.
By John B. Kogut (Department of Physics, University of Maryland, College Park, MD, USA)
By Janna Levin
By Carlo Rovelli, Erica Segre, Simon Carnell
By Sean Carroll
By Einstein, Albert
By Joao Magueijo
By Carlo Rovelli
By Leonor Godinho, Jose Natario
By Einstein, Albert, Hawking, Stephen
By Denis Brian
By Walter Isaacson
By Christophe Galfard
By Fritz Rohrlich (Syracuse University, New York)
By Richard A. Muller (University of California, Berkeley)
By Joseph Silk (, Savilian Professor of Astronomy, University of Oxford)
By Tony Hey (University of Southampton), Patrick Walters (University of Wales, Swansea)
By Jeremy Bernstein
By Albrecht Folsing
By Barry R. Parker
By Peter Collier
By Michael Friedman
By Professor Brian Cox., Brian Cox, Andrew Cohen
By Neil Skinner