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"I think crypto will slowly percolate its way up and people will adopt it gradually as user friendly, cheap products, become available."
- Neal Stephenson

Photophone  
  A line-of-sight communications device using light beams.  

He reached for the photophone receiver - out along the spatial barriers, where there was no atmosphere to carry sound or to distort and absorb a beam of modulated light, the photophone was almost the universal means of communication, from ship to ship and rock to rock.
From Collision Orbit, by Jack Williamson.
Published by Astounding in 1941
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