On Tuesday’s show

9:00 The first of three presidential debates is tomorrow night. In preparation for them, we look at what kind of prep work goes into them and what potential they have for being a “game changer.”

10:20 Louise Erdrich, author of ‘The Round House,’ joins us in the studio.

11:15 Paying for female children. More couples are paying large sums of money to sex-select their children and, increasingly, American parents are attempting to have girls. In fact, 80 percent of American couples using sex-selection are doing so to have a daughter. We’ll talk with bioethicist Jeff Kahn about the ethics behind sex-selection, and the future of the procedure.