If there is only one thing certain about life, it is that it ends. This instinctively raises a question which we human beings have pondered upon since the beginning of time: What is it that lies beyond death?
At the physiological level, the transformation of a deceased person when left to natural causes is something that we can witness; the heart stops beating, the lungs stop breathing, and the body is starved of blood and oxygen. The termination of blood flow leads to impalement of the skin. With the oxygen cut off, cells will respire anaerobically for a time, producing the lactic acid which causes the stiffening of the corpse’s muscles. Then, as the cells begin to decompose, the stiffness wanes, the temperature drops, the flesh rots – until all that is left is dried-out bones.