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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 knows a lot about the past.

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

What my research has shown me is that experts tend on the whole to form very rigid camps; that within these camps, a dominant perspective emerges that often silences opposition; that experts move with the prevailing winds, often hero-worshipping their own gurus.