Bee Buck, a freelance photographer for Churchill Downs who has shot six Kentucky Derbies and two Breeders' Cups, is the guest on this week's Boundless podcast, hosted by jockey and veterinarian Ferrin Peterson. Buck describes how she was a horse-crazy kid who got her start photographing polo matches. A former art history student, she said that the study of classic proportions has helped her to frame her photos and understand what she wants to shoot. "I crave constructive criticism," she said. "If I don't have constructive criticism that's coming to...