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"The writing is clicking away in my head and piling up, and unless I get it on paper somehow it's going to create uncomfortable pressure in my skull."
- Isaac Asimov

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
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  Tech news articles related to works by John R. Binder

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