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"The point sticks in your head: physics rules. Virtue does not triumph unless the physics allows it."
- Larry Niven

Psychoscanner  
  A device capable of taking impressions, feelings and memories from living brains; it can be used on animals as well.  

The aliens needed to know what Buck knew about human beings. They needed to know what Buck really knew and felt; fortunately, the psychoscanner worked just as well on dogs.

Psychoscanners have been able to secure excellent pictures and sound memories from the animal. It is of a species that lives in symbiosis with the creatures operating the space craft. Its utility to the superior race is not yet clear... The animal's vision appears to be relatively poor, but its hearing and smell are excellent. It's memories of smells, in particular, are especially vivid... Apparently, however, little or no technical information can be had from the animal because of the disinterest of "Buck" - this is the auditory memory of the animal's name for itself - in such matters.
From Propagandist, by Murray Leinster.
Published by Astounding Science-Fiction in 1947
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