Cat’s Cradle by Kurt Vonnegut Jr.
Best Science Fiction
3,958 books — 8,229 voters
Snow Crash by Neal StephensonCryptonomicon by Neal Stephenson
Classic Science Fiction - 1990-1999
380 books — 190 voters

The Martian by Andy WeirOld Man's War by John ScalziThe Time Traveler's Wife by Audrey Niffenegger
Best Science Fiction of the 21st Century
1,236 books — 9,186 voters
Old Man's War by John Scalzi
Best Science Fiction & Fantasy Books
8,938 books — 26,346 voters

Alas, Babylon by Pat Frank
Best Post-Apocalyptic Fiction
1,331 books — 3,623 voters