Revenants and vampire forensics

National Geographics has recently aired a documentary on 'vampire forensics' inspired by the find of a skeleton near Venice that some archaeologists have claimed to have been that of a 'vampire corpse' - see e.g. this previous post. The theory is highly improbable, but the documentary may still be very interesting to watch. I suppose that it is closely linked to the new book from National Geographics on the same subject, which is advertised in the video below.