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The book describes man's discoveries of parts of planet Earth that were accidental or planned. The period from 50,000 years ago to today's efforts in space exploration is described.
Sometimes, however, even scientists grope in the dark because the Earth does not easily reveal all its remaining secrets. Reality, as it often happens, is more exciting than any novel.
A popular science work in which Asimov, combining scientific rigor with a lucid style, explores possible threats to the survival of humanity, systematizing disasters according to their nature and probability.
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