Human: The World Within

-The human body is full of systems. Some protect us... others nourish us or keep us moving... But there's one system that controls all the others... and it might be the one that truly makes you you... the nervous system. To put it simply, it perceives the world and tells you how to react to it. Should you jump... run...eat... shiver...cry? It makes all of those split-second decisions. And it also creates emotions, ideas, and memories. Altogether, it's one incredible machine that never stops reacting. We're about to take a trip through an astonishing universe that lives right inside our bodies to uncover the systems that make us human.