Body Clock: What Makes Us Tick?

We all have a biological clock that governs our daily rhythms. It affects our health as much as diet and exercise. But what can we do to manage it better? Evolutionary biologist Ella Al-Shamahi shuts former Commando Aldo Kane inside an abandoned nuclear bunker with no way of telling the time. By stripping away the trappings of modern life, he uncovers the science of how our body clock works.