By Livio, Mario
By Young, Donald
By Robinson, Tara Rodden
By Maran, Stephen P.
By Calle, Carlos I.
By Hoagland, Mahlon, Dodson, Bert, Hauck, Judy
By Encyclopedia Britannica
By Steve Parker
By Reader's Digest
By Peake, Stephen, Smith, J.
By Eric R Kandel
By Bryon, Mike
By Smith, Heidi
By John Sullivan, Automobile Association
By AA Publishing
By Amy Ellis Nutt
By Pauline Halford
By Paul Heiney
By Parker, Steve
By Cherfas, Jeremy
By Burnie, David
By Lliana Bird, Dr Jack Lewis
By Rushforth Keith
By Dawkins, Prof Richard
By Fisher, Dr Len
By McManus, Chris
By Philip Ball, Ball, Philip
By Ian Stewart
By Geoffrey Kibby