BEVERLY HILLS, Calif. (AP) — Katie Couric and National Geographic Channel are teaming up on a documentary about the science and culture behind gender. Couric is the executive producer and host of the two-hour film, described as an in-depth look at factors involved in gender fluidity, including genetics, brain chemistry and modern culture. The film, with the working title "Gender Revolution," will premiere globally on National Geographic Channel in January 2017.