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"In 1970 I found little difficulty staying 30 years ahead of the man in the street, and now I find it difficult to stay 18 months ahead of the man on the street."
- Vernor Vinge

Zero-Gravity  
  A state in which gravity is effectively absent or cancelled out.  

Starting at the zero-gravity of earth's core, accumulative acceleration is easily built up in a four-thousand-mile tube.
From If Science Reached the Earth's Core, by John R. Binder.
Published by Thrilling Wonder Stories in 1938
Additional resources -

This term appeared first in this work, which is an essay rather than a story.

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Additional resources:
  More Ideas and Technology from If Science Reached the Earth's Core
  More Ideas and Technology by John R. Binder
  Tech news articles related to If Science Reached the Earth's Core
  Tech news articles related to works by John R. Binder

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