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There is no need to justify your explanation scientifically. But. You must not, under any circumstances try to scientifically justify anything else. In effect, by making a scientifically implausibl...
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Source: https://writers.stackexchange.com/a/43302 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There is no need to justify your explanation scientifically. But. You must not, under any circumstances try to scientifically justify anything else. In effect, by making a scientifically implausible claim to establish your world, you've shifted from SF to fantasy. However, fantasy does not have to include unicorns or vampires, or anything else. Just establish your world and get on with the story. As an example of something very much along the lines of what you're talking about, but even more so, try finding David Drake's "Men Like Us", about a post-nuclear war world, with 3 characters roaming the country making sure that nobody resurrects nuclear power. The trio are ultimately revealed to be immortal, and they got that way by being caught close to a nuclear blast. So, that's not remotely science, but the story's pretty good nonetheless.