Douglas Adams's Guide to The Hitchhiker's Guide to the Galaxy programme in the second series was so plagued by deadline problems that it almost didn't get broadcast, and the mind-boggling conditions they worked under to complete the job in time. These comments are intermixed with some clips from the radio programmes, including some highlights such as the destruction of the earth and Marvin telling everyone how depressed he is. The programme was written by Debbie Barham. The second tape runs 50 minutes and consists of Douglas Adams being interviewed by Iain Johnstone. Many topics are touched upon, often with surprising connections between them. Some of the topics discussed by Douglas
Phrases from The Hitchhiker's Guide to the Galaxy Riemann surface with a maximal number of symmetries and as a symmetry of Hyperbolic tiling made up of combinations of triangles with angle angles π/2, π/3, and π/7 . Rumours that mathematicians are grey mice have been disproved, however. The 42 Puzzle is a game devised by Douglas Adams in 1994 for the United States series of "The Hitchhiker's Guide to the Galaxy" books. The puzzle is an illustration consisting of 42 multi-coloured balls, in 7 columns and 6 rows. Douglas Adams has said, In the puzzle the question is unknown, but the answer is already known to be 42.