Many people have tried to define science fiction. I like to call it the literature of exploration and change. While other genres obsess upon so-called eternal verities, SF deals with the possibility that our children may have different problems. They may, indeed, be different than we have been.
David BrinWe already live a very long time for mammals, getting three times as many heartbeats as a mouse or elephant. It never seems enough though, does it?
David Brin