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"I don't know why I write science fiction. The voices in my head told me to!"
- Charles Stross

Freedom Machine  
  A birth control device developed using nanotechnology.  

Most of the devices that work with human reproduction are either very simple devices that impose a barrier between the sperm and the egg (which require some element of foresight to use), or they manipulate hormones, which has a number of side-effects.

...she had been using something called a Freedom Machine - a mite that lived in your womb and caught eggs and ate them.
From The Diamond Age, by Neal Stephenson.
Published by Bantam Books in 1995
Additional resources -

Stephenson proposes a very tiny machine that would live inside of a woman's fallopian tube and grab each egg that came along before it had the chance to encounter any sperm cells that might be passing by. Assuming that the nanomachine was well-trained, and didn't start attacking other cells that passed by, this could work.

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Additional resources:
  More Ideas and Technology from The Diamond Age
  More Ideas and Technology by Neal Stephenson
  Tech news articles related to The Diamond Age
  Tech news articles related to works by Neal Stephenson

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