At any given moment there is an orthodoxy, a body of ideas which it is assumed all right-thinking people will accept without question. It is not exactly forbidden to state this or that or the other, but it is “not done”… Anyone who challenges the prevailing orthodoxy finds himself silenced with surprising effectiveness. A genuinely unfashionable opinion is almost never given a fair hearing, either in the popular press or in the highbrow periodicals. - George Orwell