Ricky gives Karl some animal facts. Karl ponders the question of whether you control your brain, or your brain controls you. From Karl's diary we investigate the curious case of the invisible Chinese man, why blind people have affairs, the feasibility and usefulness of putting a mirror on the Moon, and birthdays.

Karl talks about having been rushed to hospital. He says that kidney stones were found and he had a catheter put into his penis. Karl ponders a phenomenon; Karl's diary; and more.