Moises Chambi needs only two tools to survive on the world's largest salt flat: a wooden-handled pickax and a shovel beaten into a worn fold. The 23-year-old with sun-darkened skin, prominent cheekbones, and a quick, sarcastic smile grunts softly as he repeatedly slams his ax into the parched earth of Bolivia's Salar de Uyuni. As the sun sinks behind mountains floating over the unbroken white plain, he shovels gleaming chunks of salt into... More >>>