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science fiction story about scientists who create a personal force field which makes a halo appear around their heads when it is on
Identify a time tunnel story with Old Testament desert shepherds, probably by Philip K. Dick
Sci-fi adventure novel set in the Yucatan, and based on the myth of Quetzalcoatl and aliens
Time machine takes him several years into the future to collect news that can be used to avoid disasters. Subsequent trips show things getting worse