The undead are beings in mythology, legend, or fiction that are deceased but behave as if they were alive. A common example of an undead being is a corpse reanimated by supernatural forces, by the application of either the deceased's own life force or that of another being (such as a demon). The undead may be incorporeal (ghosts) or corporeal (mummies, vampires and zombies). The undead are featured in the belief systems of most cultures, and appear in many works of fantasy and horror fiction. The term is also occasionally used for putative non-supernatural cases of re-animation, from early experiments like Robert E. Cornish's to future sciences such as chemical brain preservation and cryonics. Bram Stoker considered using the title, The Un-Dead, for his novel Dracula (1897), and use of the term in the novel is mostly responsible for the modern sense of the word. The word does appear in English before Stoker but with the more literal sense of 'alive' or 'not dead', for which citations can be found in the Oxford English Dictionary. In one passage of Dracula, Nosferatu is given as an 'Eastern European' synonym for 'un-dead'. Stoker's use of the term 'undead' refers only to vampires, the extension to other types of supernatural beings arose later. Most commonly, it is now taken to refer to supernatural beings who had at one point been alive and continue to display some aspects of life after death, but the usage is highly variable. Literature In Bram Stoker's novel Dracula, Van Helsing describes the Un-Dead as the following:Before we do anything, let me tell you this.