Within hours of a person’s death their body begins to deteriorate. The first sign is the swelling of the abdomen as gasses build up in the stomach. Soon the cells break down and putrefaction sets in producing a foul odour. Depending on the external temperature and the presence of insects or scavengers, within two or three days’ no one would like to touch, go near, or even want to see a corpse. But for at least 2000 years it has been observed that some corpses remain uncorrupted when they would be expected to go through the normal process of decay and disintegration.