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"I don't have an e-mail address. As much as I admire the Internet I suffer literally agoraphobia, which in it's original sense means a fear of the marketplace. I do not want to receive three hundred e-mail messages per week from strangers…"
- William Gibson

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

Space travel is solved. Starting at the zero-gravity of Earth's core, accumulative acceleration is easily built up in a four-thousand-mile tube. The ships reach Earth's surface where gravitation is strongest with an appreciable velocity that makes the take-off a simple process of continuation.
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 illustrated 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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