Desc: National Geographic Special: Skin: Directed by Ron Bowman. With Alex Chadwick, Sadaf Minapara. National Geographic looks at the largest human organ: the skin. People are obsessed with its beauty and humbled by its flaws. The ultra-thin shield protects us from dangers but often defines and shapes the body loving inside it. National Geographic offers a trip back in time to explore the evolution and human and examines the rainbow of diverse skin that exists with us today.