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

Doorseal  
  A portable plastic seal used in temporary camps to keep moisture from escaping from dwelling places.  

The Fremen, the nomadic natives of Dune, used a wide range of devices to make their environment usable. Dune was a planet with very little moisture; no open water ran across the surface of the planet. Conserving moisture was essential to survival.

Stilgar turned away, led them down through the rocks, a twisting and turning path into a shadowed cleft that admitted them to the low entrance of a cave. Men hurried to fasten a doorseal behind them. Glowglobes showed a broad, dome-ceilinged space with a raised ledge on one side and a passage leading off from it.
From Dune, by Frank Herbert.
Published by Putnam in 1965
Additional resources -

Underground meeting places were used as temporary shelters; they were made livable with door seals to retain the water lost in ordinary respiration. See stillsuit to see how they did it while on the move.

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