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"The point sticks in your head: physics rules. Virtue does not triumph unless the physics allows it."
- Larry Niven

Martian Perambulator  
  A mechanized transport for heavy gravity environments for beings born in lower gravity environments.  

How best to get around in heavy gravity?

At the ringside opposite them a table had been removed to make room for a large transparent plastic capsule on wheels. Don had never seen one but he recognized its function; it was a Martian's "perambulator," a portable air-conditioning unit to provide the rare, cold air necessary to a Martian aborigine. The occupant could be seen dimly, his frail body supported by a metal articulated servo framework to assist him in coping with the robust gravity of the third planet.
From Between Planets, by Robert Heinlein.
Published by Charles Scribner's Sons in 1951
Additional resources -

Compare to the skrode from A Fire Upon The Deep (1992) by Vernor Vinge.

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Additional resources:
  More Ideas and Technology from Between Planets
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Between Planets
  Tech news articles related to works by Robert Heinlein

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