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"No one has ever produced a statement of fact that was technically true. The most accurate statements of science we have today are accurate to only 15 decimal places."
- Bart Kosko

Wandering Mine  
  A landmine with legs.  

Wandering mines, you took them out on the edge of the desert, set them down and activated them, like in a sandy wash. And they settled down in the sand and rock, burying themselves, until sand covered them. And then you went away, and the enemy entered the area. And after a preset time, if nothing had crossed them, they dug themselves up, scuttled across the Kalahari on their crab legs, found a new place and buried themselves again. You could preset the range, bury a beacon to keep them fairly close - but the beacon could alert the enemy, so mostly they were set at random, set so as not to wander more then a couple of hundred meters from where they were first buried.
Technovelgy from Half the Day is Night, by Maureen F. McHugh.
Published by Tor in 1994
Additional resources -

Thanks to Bob Yeager for submitting this item.

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Additional resources:
  More Ideas and Technology from Half the Day is Night
  More Ideas and Technology by Maureen F. McHugh
  Tech news articles related to Half the Day is Night
  Tech news articles related to works by Maureen F. McHugh

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