Contemporary medical science believes brain is the seat of the person. A person who is brain dead is declared dead and other living organs are transplanted. Many times people who had heart transplantations had change of personality. They even remember some things which happened to brain dead person. This raises question about declaring a person whose heart beats but brain is dead as dead. What if contemporary medical science is wrong? Now life can be prolonged with artificial hearts. If we can have artificial brains and make brain dead persons live how wonderful it will be?
At one time doctors believed blood letting will bring down temperature and cure fever. Many times blood letting brought down temperature to such levels that the patients died. Many theories and practices have been proved wrong. Medical scientists must re-examine their theories about brain and death.