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"Always listen to experts. They'll tell you what can't be done and why. Then do it."
- Robert Heinlein

Dew Gatherers  
  Devices used to gather morning dew as a source of drinking water.  

Then he saw the human figures moving into the flower fields, sweeping them with strange scythe-like devices - dew gatherers. Water so precious here that even the dew must be collected.
From Dune, by Frank Herbert.
Published by Putnam in 1965
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