By Andrew Viner
By Pinel, Adrian, Pinel, Jeni
By Noaa, N/A
By Gardner, Martin
By Devadas, Srini
By Haselbauer, Nathan
By Dunn, Angela Fox
By Jenny Tyler, Graham Round
By Sachar, Louis
By Bartlett, Roger
By Matthew Syed
By Taylor, Don
By Mullins, Roy
By Jenkins, Adrian
By Phillips, Richard
By Sole, Puzzles Numbers and Infinity Tim
By Bloom, Jonathan
By Clive Groome
By Robin J. Wilson, Wilson, Robin J.
By Tamminen, Terry
By Moscovich, Ivan
By Branley, Dr Franklyn M, Keller, Holly
By Rob Eastaway, John Haigh
By Allenby, R. B. J. T.
By Strogatz, Steven
By Hilger, Matthew