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"I've got this beautiful panoramic three-dimensional painting of Mars based on Martian photos. It's 30 feet wide. You can pick out every pebble on the Martian landscape. And who'd have dreamed you could do that?"
- Arthur C. Clarke

Dentata  
  An anti-rape device.  

...a very small hypodermic needle slipped imperceptibly into the engorged frontal vein of his penis, automatically shooting a cocktail of powerful narcotics and depressants into his bloodstream.
From Snow Crash, by Neal Stephenson.
Published by Bantam in 1992
Additional resources -

Legends and stories surrounding the vaginus dentata or "toothed vagina" have been around for centuries in cultures all over the world. In the Middle Ages, some Christians believed that witches could grow fangs in their vaginas. (Although very rare, teeth can actually be found in vaginas; dermoid cysts are formed from the outer layer of embryonic skin cells, and these cells are able to mature into teeth.) The term vagina dentata was created by Sigmund Freud as a part of his theories concerning castration anxiety.

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Additional resources:
  More Ideas and Technology from Snow Crash
  More Ideas and Technology by Neal Stephenson
  Tech news articles related to Snow Crash
  Tech news articles related to works by Neal Stephenson

Dentata-related news articles:
  - Rape Trap Like Snow Crash 'Dentata'

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