Quote:
Originally Posted by fjtorres
Misses entire sub-genres like Alternate histories, crosstime travel, stories about alien societies without humans...
Heinlein preferred to classify stories as:
- What if...
- If only...
- If this goes on...
- The little tailor...
The genre can be analyzed a zillion diferent ways and all are equally valid. More or less. 
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Universes with no humans at all, etc... e.g. The Clockwork Rocket