can, but they can recover from even very severe injuries in remarkably short periods of time. Usually, Buffy is completely healed within 24 hours of being injured, though more serious injuries have been shown to take at least a few days, and Slayers can receive scars. Buffy has survived contact with a live electrical wire; the normally lethal jolt simply renders her unconscious and melts her shoe soles. The Slayer also appears to have a heightened immune system: Buffy is depicted as almost never getting sick, aside from contracting the flu during a period of great emotional stress. Senses Slayers possess a heightened awareness of their surroundings. This heightened awareness can, with experience, allow the Slayer to know the position of an attacker and fight them blindfolded or in the dark. This is not a constant ability, however. This skill must be honed through practice and the Slayer usually must focus to achieve the full benefit, as shown in season 5 "Family", during which, when Tara casts a spell that causes demons to be invisible to the gang, Buffy orders everyone to be quiet and fights a demon without seeing it. A Slayer also has the limited ability to detect the presence of vampires (and presumably other demons). This power must be honed as with the heightened awareness, and the Slayer must focus to achieve the full effect. This does not prevent Buffy (and other Slayers) from being ambushed by vampires. Buffy could be unusually deficient in this sense: Although she initially distrusts Angel when first meeting him and seems to sense that he is following her for a period of time, she doesn't realize until he shows her his vampiric face for the first time that he is a vampire. However, her ability might have been compromised by the presence of Angel's soul. Additionally, in "Dirty Girls," Faith attacks Spike under the impression that he is chasing an innocent girl and is unaware that he was in fact pursuing a vampire until said vampire attacks her from behind. In the 1992 film, the ability to detect vampires manifested itself in the form of feminine cramps. (Merrick describes this as a "natural reaction to their unnatural presence.") This ability was inconsistent, as Buffy was unaware that a vampire was hiding in a photo booth right next to her. The movie, however, is not considered canon, and this aspect of her