a science Fiction book by Orson Scott Card
Playing with the time stream isn't new to science fiction, but Card (Ender's Game), who's won both a Hugo and a Nebula, gives the concept a new twist here-with mixed results. His angle is to make the temporal interference not accidental but intentional, … see full wiki
They determine that their viewing machine also has time travel abilities and they make plans to visit the past to change the present for the "better." Card has done an amazing amount of research into the life of Columbus and tells Columbus' tale almost like a novel, in the tradition of such classics as I Claudius and Quo Vadis.
Additionally, Card presents plausible explanations for Atlantis and the Noah stories. A good mixing of science fiction and history.
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