Skin, the largest organ of the body, protects us in many ways. We explore its structure, its features, how it functions, and how it helps us regulate body temperature. Feathers, scale, horns, nails, fur, and hair are all developed from skin. We learn about the epidermis, dermis and hypodermis; sebum glands, goosebumps, sweat and odour; skin as a sensory organ; the hazards of UV exposure, the role of pigmentation, and skin cancer; elasticity, acne, and how to protect and care for your skin.