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I think he's a human astronaut. His boots have germs he is not aware of, which prove fatal to the aliens. It might be by Arthur C. Clarke.

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  • There is a lot of guidance in this post to help you describe the story you're looking for in more detail - you can edit in anything else you remember. Commented May 13, 2017 at 21:41
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    Vaguely reminiscent of Clarke's "Before Eden", which was the answer to this other question. Could that be the one you're thinking of?
    – user14111
    Commented May 13, 2017 at 22:36
  • That's it! I just read it. It's a wonderful cautionary tale. I thank you for pointing it out to me. Commented May 14, 2017 at 0:07

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