By Richard Panek
By Ken Croswell
By Leonard Susskind, Art Friedman
By Janet Bord, Colin Bord
By Andrew Smith
By Timothy Ferris
By Giles Sparrow
By Professor Brian Cox, Professor Jeff Forshaw
By John Gribbin
By DK
By Davies, John
By Davies, P. C. W.
By Jo Dunkley
By James Trefil
By James S. Trefil
By Didier Fassin (Institute for Advanced Study, Princeton University, USA)
By Matthew Hedman
By Stephen C. Meyer
By Stephen Hawking
By Noel Edmonds
By Michael Frayn
By Frank Wilczek
By Leon Lederman, Dick Teresi
By Hans C. Ohanian (University of Vermont)
By Storm Dunlop, Wil Tirion, Royal Observatory Greenwich, Collins Astronomy, Collins Books