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+1 on the SF comment, that's one of the things I love about it. Sometimes it doesn't even have to be a new idea as such - just getting you to think through the implications of a "fantastical" idea.
For instance being able to extend your life indefinitely - hardly original. But I remember reading Elizabeth Moon (Serrano I think?) where it touched on the impact on the military. Where generals would then never reach a retirement age, which leaves ever growing discontent from those underneath particularly all the new recruits. Leaving a lot of trained for violence individuals with a justifiable cause for complaint. Something that in hindsight has you thinking "oh yeah, of course that would be a problem" but not perhaps something you thought about if you ever day-dreamed about being able to live longer...
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