computer and human brain-computer

Difference between computer and brain 

The difference between a brain and computer can be expressed in a single word, that is "complexity". Human brain The human brain is the most complicated thing known to us. The human brain weighs only three pounds. In these three pounds there are ten billion nerve cells and a hundred billion smaller cells. 
The billions of these cells are interconnected in a very complicated network that cannot be understood so easily. “Can a computer think?” That depends on what you mean by “think.” If solving a mathematical problem is “thinking,” a computer can “think” and do so much faster than a man. 
Of course, most mathematical problems can be solved quite mechanically by repeating certain processes over and over again. Even the simple computers of today can do that. Computer solves problem It is frequently said that computers solve problems only because they are "programmed" to do so. They can only do what men have fed in them. 
One must remember that human beings also can do only what they are "programmed" to do.Our "programme" is very complex. We might like to define "thinking" as the "creativity that goes into writing a play, composing a symphony, conceiving a scientific theory, or making a judgment." In that sense computers certainly can't think. 
Duplication of human brain The brain is made up of cells in a certain arrangement. The cells are made up of atoms and molecules in certain arrangements. To duplicate the material complexity of the brain is, therefore, to duplicate everything about it.
But how long will it take to build a computer complex enough to duplicate the human brain? Perhaps not as long as some think. Long before we approach a computer, we will perhaps build a computer that is, at least, complex enough to design another computer more complex than itself. This more complex computer can design one still more complex than itself.
 This more complex computer can be developed into one still more complex than the previous one and so forth. Complexity explosion In other words, once we pass a certain critical point, the computers take over and there is "complexity explosion." In a very short time thereafter computers may exist that will not only duplicate the human brain but will perhaps surpass it. 
Will a time ever come when a man will have to handover the job to someone who can do it better than he Yes! Perhaps. But we will have to wait till such a wonder takes place! Computer is a machine which works like a brain .It can store memory .It can save files and then again remember it. 
Most scientists and knowledgeable observers agree that computers will change our lives completely, more than the automobile, television, or any technological innovation has done so far. How far can computers go?
 Science writer Isaac Asimov compares the computer with the human brain. His conclusions may frighten you. They're sure to make you stop and think. But computers definitely are going to create havoc, somewhere, sooner or later! Let's wait and see!