Temple Grandin, 68, is one of the world’s top experts on nurturing farm animals. She trains farmers and ranchers to raise livestock without causing them pain or fear. Those methods and insights make their care — called animal husbandry — faster and easier because the animals do not become anxious. Grandin also has designed slaughterhouses, facilities where animals are killed for food. Animals move through these facilities without stress. Death comes instantly and painlessly. About 30 million cattle are killed for meat every year in the United States. Today more than half of those cattle are processed in systems that Grandin designed.