Do Androids Dream of Electric Sheep?Phillip K. Dick's Do Androids Dream of Electric Sheep? tells the exploits of Rick Deckard, an android killer in a post-nuclear San Fransisco where most humans have emigrated to Mars. Deckard's task is made harder by the fact that the androids he's supposed to kill look and act like humans. The novel Blade Runner is based on Do Androids Dream of Electric Sheep?.
This geek book recommendation is featured in Jay Garmon's TechRepublic article "The perfect sci-fi library."
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