Story : Piero Angela takes us on a great journey into intelligence and emotions, to discover the most complex object in the known universe: the brain. How do thoughts form, when does aggression arise, why do we sometimes feel like we've already seen a scene? A guest in the studio is neuroscientist Piergiorgio Strata, who will explain the limbic system, the area that "colors" our life, so to speak, which is at the origin of pleasant or unpleasant sensations, but also of aggressive behavior. The truly surprising story of an American railroad worker who in the mid-19th century survived the very serious accident of a rod that pierced his skull and suddenly changed his character, becoming very aggressive. Alberto Angela will explain how our brain has developed over time, with some very interesting archaeological finds. Ethologist Danilo Mainardi will also make a quick foray into the brains of animals, from ants to chimpanzees.