It was a moment frozen in time – an 1873 Winchester repeating rifle propped up against the trunk of a juniper tree exactly where its owner had left it over a hundred years ago. Eva Jensen, an archaeologist out scouring the hillsides of Nevada’s arid Snake Mountains for Native American artefacts, let out an involuntary cry of surprise when she stumbled across the find, and then fell into silence. “I recognised it instantly, but it takes your brain a little while to catch up,” she told The Telegraph. “The reality of it, I let out an exclamation and the...