By Noel Edmonds
By Richard Panek
By Giles Sparrow
By Michael Frayn
By Stephen Hawking
By Frank Wilczek
By Leon Lederman, Dick Teresi
By Hans C. Ohanian (University of Vermont)
By Sir Martin Rees
By McEvoy, J.P., Zarate, Oscar
By Martin Rees
By Storm Dunlop, Wil Tirion, Royal Observatory Greenwich, Collins Astronomy, Collins Books
By Peter Altman
By Ken Croswell
By Stephen C. Meyer
By Matthew Hedman
By Didier Fassin (Institute for Advanced Study, Princeton University, USA)
By James S. Trefil
By James Trefil
By Jo Dunkley
By Davies, P. C. W.
By Davies, John
By DK
By John Gribbin
By Professor Brian Cox, Professor Jeff Forshaw