Quote:
Originally Posted by gmw
Good point ... although I do find travel back in time a little harder to swallow, even/especially as a laymen. To me it always feels like fantasy.
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There's also stories like Hal Clement's "A Question of Guilt" - an ancient Roman trying to give his son a blood transfusion. No time travel, no alternate history, no future technology. Just a man trying to grasp the physics of a problem, and save his son's life.
By most any definition, it's a hard science fiction story despite all the devices it doesn't have.