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"There was a time when one old eccentric guy with a notebook could do something important to science. Now even the resources of a major university are often not enough."
- Jerry Pournelle

Ice Dart  
  A variation on an old locked door mystery idea.  

This is an inspired use of the "stabbed with an icicle" ploy (which, of course, leaves no murder weapon). A tiny flechette of ice is shot into one region of the body; the damage is done in another.

Davis drew a pellet pistol and loaded it with an ice heart dart from a small Dewar flask. The thin ice dart melted in the warm muscle tissue of [the man's] buttock. There it released a mix of brucine and potassium into the man's bloodstream… he convulsed in a massive heart attack.
From Nanotime, by Bart Kosko.
Published by Avon Books in 1987
Additional resources -

And the ice melts, leaving no trace of the weapon itself.

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Additional resources:
  More Ideas and Technology from Nanotime
  More Ideas and Technology by Bart Kosko
  Tech news articles related to Nanotime
  Tech news articles related to works by Bart Kosko

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