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Jan 14, 2018 at 18:19 answer added user18979 timeline score: 6
Jan 14, 2018 at 14:42 comment added Otis The solar sail and underground intercontinental rail network are elements of "The Mote in God's Eye" by Larry Niven and Jerry Pournelle -- possibly you're conflating a couple of different stories you read around the same time?
Jan 14, 2018 at 2:39 comment added LAK @Reader56 The main character in A World Out of Time does look for immortality drugs; they're a fairly large part of the plot., though I don't remember an underground rail network.
Jan 14, 2018 at 2:13 comment added Reader56 Thank you. However I've now looked at the synopsis of that book and it doesn't seem to match my memory of the story.
Jan 14, 2018 at 1:42 comment added user14111 Perhaps A World out of Time by Larry Niven. (The spaceship uses a ramjet, not a solar sail.)
Jan 14, 2018 at 1:16 history edited Buzz CC BY-SA 3.0
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Jan 14, 2018 at 1:10 review First posts
Jan 14, 2018 at 1:38
Jan 14, 2018 at 1:10 history asked Reader56 CC BY-SA 3.0