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"No one has ever produced a statement of fact that was technically true. The most accurate statements of science we have today are accurate to only 15 decimal places."
- Bart Kosko

Space Suit Helmet Rearview Mirror  
  Having a way to easily see behind you while wearing a spacesuit.  

Another thing space suits should have is rearview mirrors. While you are at it, add a window at the chin so that you can see where you step. But of the two, I would take a rearview mirror. You can’t glance behind you; you have to turn your entire body. Every few seconds I wanted to see if they were following us — and I couldn’t spare the effort. All that nightmare trek I kept imagining them on my heels, expecting a wormy hand on my shoulder. I listened for footsteps which couldn’t be heard in vacuum anyhow.
Technovelgy from Have Space Suit - Will Travel, by Robert Heinlein.
Published by Scribners in 1958
Additional resources -

Thanks to Atomic Rockets for having this quote.

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Additional resources:
  More Ideas and Technology from Have Space Suit - Will Travel
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Have Space Suit - Will Travel
  Tech news articles related to works by Robert Heinlein

Space Suit Helmet Rearview Mirror-related news articles:
  - Rear View Heads Up Display For Motorcycle Helmets

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'...the walking mills of Puffy Products began to tread delicately on their centipede legs across the wheat fields of Kansas.'

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'...using a neutralizing electronic impulse.'

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'...the Hole is something like a vortex or a whirlpool?'

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'ZARNAK, YOU'RE TO COMMAND A SCOUTING EXPEDITION --- FIND OUT WHAT THIS IS ALL ABOUT!'

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'These are your rudimentary seed packages... Some will combine in place to form more complicated structures.'

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