Experts on one’s own side are indeed valuable in the assessment of Intelligence, but their real function is not to make the final assessment—they are in effect your spies on the laws of nature which are relevant to the particular weapon under development. Usually they will be correct in their observations, and indeed more correct than most of your other sources. But from time to time they will be wrong for the reasons that I have just described and such occasions usually turn out to be very important. Their evidence must therefore be weighed impartially together with that from all other
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