dangerous city on the planet. a drug cartel's playground. coming up next, an up close look at the ghost towns surrounding juarez just south of the u.s.-mexico border. we'll take you inside. at purina one, we want your cat to be as healthy as possible. so we set out to discover the nutritional science in some of nature's best ingredients. that's how we created purina one with smartblend. nutritionally optimized with real salmon, wholesome grains, and essential antioxidants for strong muscles, vital energy, a healthy immune system, and a real difference in your cat.