By THE NEW YORK TIMES, OCT. 13, 2014
The titles ranked here are selected by the science editors from all adult nonfiction books reported to The New York Times for the month. These titles are fundamentally based on the sciences; those for which science is more tangential or peripheral are generally excluded. Rankings reflect combined print and e-book sales for September 2014. An asterisk (*) indicates that a book’s sales are barely distinguishable from those of the book above. A dagger (†) indicates that some bookstores report receiving bulk orders.
A version of this list appears in print on October 14, 2014, on page D6 of the New York edition.