Every few years, some prominent public intellectual is privileged to travel the world making a series about the history of humanity. In 1973, it was mathematician Jacob Boronowski's turn, and 'The Ascent of Man' tells of the rise of civilisation as viewed through the lens of science. The formula has hardly changed in the ensuing 50 years - rather surprisingly, even computer graphics (such as we might see in a more modern programme) had already arrived and are on display here. What's most noticeable is that firstly, Boronowski doesn't dumb down; but also, his series was subtitled 'A Personal View' and that it is, full of individual insights of a sort that now feels quite rare. Sometimes his thoughts are deep, sometimes less so; but they're all his, whereas it's sadly more common for this sort of programme to feel like an official guidebook, offering the consensus view of mankind's greatest hits. Instead, Boronowski was allowed to talk at length, and was thus able to make subtle points that rely on many words. In this respect alone, the series does feel dated; but only in reminding us of something we have lost.