The lost traveller

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Poul Anderson

An experiment in the future gone awry...and Duncan Reid, American architect of the 20th century, came out of unconciousness to find himself hopelessly marooned in the far distant past. Bound to him were three of the strangest humans he had ever encountered... a medieval Russian, and a fourth-century Hun, and a sacred priestess who worshiped him as a god. And all shared the same fate--pulled through a hole in time to a present which was ancient history. Together the quartet formed a strange alliance which none dared break. For not only were their own futures at stake... but the very future of the world they had found

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John Brunner

This 1975 book pretty much nailed the contradictions inherent in global networking, long before the network was created. It's full of wiretapping spooks, genius kids, networked churches, fake identities, network worms, encryption, nonprofits that outfox the spooks to help society, the works.

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Robert Heinlein

Synopsis courtesy of GoodReads : Utopia has been achieved. For centuries, disease, hunger, poverty and war have been things found only in the history tapes. And applied genetics has given men and women the bodies of athletes and a lifespan of over a century. They should all have been very happy.... But Hamilton Felix is bored. And he is the culmination of a star line; each of his last thirty ancestors chosen for superior genes. Hamilton is, as far as genetics can produce one, the ultimate man. And this ultimate man can see no reason why the human race should survive, and has no intention of continuing the pointless comedy. However, Hamilton's life is about to become less boring. A secret cabal of revolutionaries who find utopia not just boring, but desperately in need of leaders who know just What Needs to be Done, are planning to revolt and put themselves in charge. Knowing of Hamilton's disenchantment with the modern world, they have recruited him to join their Glorious Revolution. Big mistake! The revolutionaries are about to find out that recruiting a superman was definitely not a good idea....

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[by] Clifford D. Simak

Coming from the future, our children's children walked through holes in the air. The holes were time tunnels and down them were fleeing our after-generations, escaping from an invasion of intelligent yet murderously savage aliens.