The three laws of Robotics: 1) A robot may not injure a human being or, through inaction, allow a human being to come to harm 2) A robot must obey orders given to it by human beings except where such orders would conflict with the First Law. 3) A robot must protect its own existence as long as such protection does not conflict with the First or Second Law. With these three, simple directives, Isaac Asimov changed our perception of robots forever when...

Story of a special group of technicians in the future world, whose duties involve time travel.

An ageless hermit runs a secret way station for alien visitors in the Wisconsin woods in this Hugo Award–winning science fiction classic Enoch Wallace is not like other humans. Living a secluded life in the backwoods of Wisconsin, he carries a nineteenth-century rifle and never seems to age-a fact that has recently caught the attention of prying government eyes. The truth is, Enoch is the last surviving veteran of the American Civil War and, for...