How will "Lightness" do in December? I'm interested in how Frank Wilczek's new book about fundamental phyics is doing in the wide-audience book market. It came out in early September and here is how it has fared relative to a convenient benchmark: Code (Text): 1 October 1.9 1 November 2.2 ... 9 November 1.1 ... 1 December ...? What this means is that, judging by the Amazon salesrank listing, The Lightness of Being has been selling about twice as well as the string benchmark, at least until recently. During the months of September and October it stood higher by that ratio (smaller rank) than the average used here for comparison. As a test of my own perceptions, I'll go on record with a prediction for 1 December. I'm forecasting that the salesrank ratio of this book relative to benchmark will be 1.0. I think it will be right on par with the average of the five most popular stringy books. To give an example of how the ratio is calculated, as of noon pacific on 9 November, Lightness ranked 2957 and the five most popular stringy books were Fabric, Black Hole, Parallel, Elegant hardbound, and Elegant (with ranks 1937, 2679, 2966, 3766, 4316) making the benchmark average 3132.8. Comparing Lightness rank 2957 with the topfive stringy average 3132.8 shows that Lightness was doing just slightly better---a ratio of 1.06, which we can round off to 1.1---on that day.