I can't see any other explanation for it. Just looked at amazon physics bestseller list. You'd expect stringy books to be way up there, parents buying Brian Greene for the boys, Lisa Randall for the girls. Or am I wrong? Wouldn't you expect that? I know a highschool senior* who last year asked her dad for Elegant and Warped---those two books for Christmas---and she got them. https://www.amazon.com/gp/bestsellers/books/14545/ref=pd_ts_b_ldr/102-1454980-4598542 =================== as of noon Tuesday 05 december here are the top five on the physics list, and the other numbers are the overall sales rank among all books. 1. Your Brain on Music 327 2. Sagan: Varieties of Scientific Experience 410 3. Smolin: The Trouble with Physics 485 4. a Mars picture book 626 5. Greene: Elegant 1044 Incidentally, the average standing of the five most popular stringy books was 30.4 Greene elegant 5 Greene fabric 12 Randall warped (hardcover) 27 Kaku parallel 54 Randall warped 55 (The hardcover edition of elegant came close on their heels, as #56) At this point people must be deciding to give the Smolin book as Christmas presents (like that Mars coffeetable book, and the 1985 Sagan lectures that just came out). Or? *Now a freshman in college.