A camel, a horse and a Gila monster were guest instructors Thursday at Bordewich-Bray Elementary School, teaching students about Nevada's history and its relevance in today's world. "This is one of the most impressive programs that I'm aware of," State Archivist Guy Rocha, who helped coordinate the Nevada Day celebration. "These kids are having a wonderful experience, arguably a lifetime experience. I don't know of anything comparable."In honor of Nevada's admission into union on Oct. 31, 1864, the staff at Bordewich-Bray transforms the school one day each year into a hands-on exhibit of the state's heritage. This year, 18 stations …