Our brain controls so many functions of our body besides being the powerhouse of information. Few vital functions of our brain are motor control, visual processing, auditory processing, sensation and learning. Considering all the functions of our brain there is no second thought that it is the most vital organ of our body beside our heart. Any kind of brain malfunction can be well understood if related to the current technology that is used in computer. The hard disk contains all the vital information of the computer and without it, the computer is as good as dead. If the hard disk crashes it is tough to recover it back and in most cases it cannot be recovered. Similarly if Amnesia or Alzheimer disease affects our brain it first destroys our brain cells and affects our memory. Loss of memory renders us useless, as we tend to forget all the skills that we have learnt over the period of time including language too. Any such disease can turn a human being into nothing less than vegetable.