Article Photos: OU football: Bob Stoops relaxed, jovial before Sooners' first preseason practice 3/4

University of Oklahoma head coaches from left, Bob Stoops, Sherri Coale and Lon Kruger speak during the 2013 Sooner Caravan on Wednesday, July 31, 2013 at the Cox Convention Center. Photo by Aliki Dyer/ The Oklahoman