Out For The Count

Like the Periodical Cicada, Marcus de Sautoy is observed only occasionally on British television and presumably at prime intervals. When last seen, in 2009, Sordel's favourite boffin was frolicking on a beach with everyman-for-hire Alan Davies, but now he is out on his own, trying to solve The Code, which is his post-Langdonian nomenclature for boring old mathematics.

"The Code" is evidently all around us, a mysterious and enthralling puzzle that demands our awed investigation. Consider, for example, an ancient standing circle whose circumference and diameter Marcus enterprisingly appraised with a tape measure before sitting down with a notebook to divide the larger number by the smaller. There we go: 3.2 ... the number that underpins all things.

Well, perhaps not. It turns out that the number that underpins all things is not 3.2 but another number. If you can work out what that number is then you are streets ahead of this programme, where the well-meaning du Sautoy attempted to demonstrate all sorts of extraordinary things and failed conspicuously.

From the statistics of a fisherman's daily catch, knowing only how many years that fisherman had been fishing, du Sautoy was able to work out the weight of the largest Dover sole that the fisherman had ever caught. Three pounds, declared Professor du Sautoy. When the fisherman said that his biggest Dover sole had been "three to three-and-a-half pounds" one half expected the mathematician (who looks disarmingly like Simon Pegg's smarter brother) to turn to the camera and say "well, we all know what liars fishermen are."

The problem with all this popularisation should have been obvious at the outset: boring old mathematics works wonderfully on paper, but du Sautoy's attempts to show it in action run up against the fundamental inability of the audience to keep pace with even his most pedestrian insights. Leaning over the shoulder of a flight controller, du Sautoy explained how the calculations involved in Radar depend on the Imaginary Unit. (Go on, click through that link ... I dare you.)

The bemused controller (presumably thinking: who let this guy in here and where's his handler?) smiled with good-natured befuddlement and said that there was nothing imaginary going on in his tower.

But of course there was.

Imaginary educational television: a world where experiments that don't work are substituted for explanations that you can't possibly understand.