By Bruce, Colin
By James Kakalios
By Govert Schilling, Martin Rees
By Stephen Hawking (University of Cambridge)
By Kip S. Thorne, Stephen Hawking
By Robert Oerter
By Gary Zukav
By Professor Emeritus John W Moffat (University of Toronto)
By Ilya Prigogine
By P. A.M. Dirac
By Charles Proteus Steinmetz
By J. Weber
By Derek F. Lawden
By Theodore Frankel
By Edwin A. Abbott
By RESNIC
By John Gribbin
By Skinner, Ray
By Professor Brian Cox, Professor Jeff Forshaw