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"Self-education is, I firmly believe, the only kind of education there is."
- Isaac Asimov

Bone Conduction Receiver  
  A concealed radio receiver.  

“I’m glad we got these new headsets fitted out in time,” Ardmore observed as his striker fitted his turban to his head.

The turbans had originally been intended simply to conceal the mechanism which produced the shining halo which floated above the heads of all priests of Mota. The turban and the halo together made a priest look about seven feet tall with consequent unfavorable effect on the psyche of the Asiatics. But Scheer had seen the possibility of concealing a short range transmitter and receiver under the turban as well; they were now standard equipment.

He settled the turban with his hands, made sure that the bone conduction receiver was firm against his mastoid, and spoke in natural low tones, apparently to no one, “Commanding officer— testing.”

Apparently inside his head, a voice, muffled but distinct, answered him, “Communication watch officer — test check.”

From Sixth Column, by Anson MacDonald.
Published by Astounding Science Fiction in 1941
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