National Geographic Explorer Season 10 Episode 5 S10 Ep5

Explorer travels to Iceland, where a unique gene pool could unlock the cure to diseases like Parkinson's and Alzheimer's. Correspondent Ryan Duffy investigates the skyrocketing black market demand for rhino horns that's decimating the animal's global population. And take a hard, punishing look at Kayfabe, the code of conduct that governs America's greatest athletic drama, professional wrestling. Dan Rather hosts.