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" I try to sit down at the typewriter four times a day, even if it's only five minutes, and write three sentences. And if I feel like going on, or if something turns me on I'll just keep writing till I'm written out."
- Roger Zelazny

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
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