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An expert is someone who tells you why you can't do something.

An expert is someone who knows a lot about the past.

An expert is one who knows more and more about less and less.

An expert is someone who knows some of the worst mistakes, which can be made, in a very narrow field.

An expert is someone who has succeeded in making decisions and judgements simpler through knowing what to pay attention to and what to ignore.

An expert is a man who has made all the mistakes which can be made, in a narrow field.

An expert is a person who avoids the small errors while sweeping on to the grand fallacy.

An expert gives an objective view. He gives his own view.

An expert is somebody who is more than 50 miles from home, has no responsibility for implementing the advice he gives, and shows slides.

An expert knows all the answers - if you ask the right questions.