[short story] `Living Fossil` is a classic science fiction story on the concepts of human extinction and future evolution by L. Sprague de Camp. It was first published in the magazine Astounding Science-Fiction for February, 1939. It first appeared in book form in the anthology A Treasury of Science Fiction (Crown Publishers, 1948); it late...
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http://en.wikipedia.org/wiki/Living_Fossil_(short_story)

A living fossil is a living species (or clade) of organism that appears to be similar to a species otherwise known only from fossils, typically with no close living relatives. Normally the similarity is only by an imagined physical resemblance, between two different species, one extinct, the other extant. It is an informal non-scientific term, mos...
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http://en.wikipedia.org/wiki/Living_fossil
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