Earth is dying. Its human population has declined catastrophically; people have become so isolated that few children are being born. The usual cause of death is self-termination. The Futurists, aided by the worldwide computer network known as Central, take a desperate gamble. They reach into the past to extract candidates who might possess the qualities that the people of 25th Century Earth have lost: courage, determination, curiosity, and stubbornness. But how to know if they've found the right ones? The candidates are transplanted to a parallel Earth during the late ice age, a world of giant mammals that includes bison, mammoths, dire wolves, and sabertooth cats. Darwin
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