Article: Earlier migration to Asia by humans' ancestors is cited

SAN FRANCISCO -- Scientists have determined that the primitive human fossils called "Java man" from Indonesia are nearly 1.8 million years old, a startling discovery that suggests that modern man's direct ancestors left Africa 800,000 years earlier than had been thought.

The bones, found decades ago, are scientifically termed Homo erectus. Their redating means not only that this species of human ancestors began exploring the world earlier than anthropologists had believed, but it also explains another puzzle -- why no stone tools characteristic of Homo erectus in Africa had been found in Java or elsewhere in Asia.

The answer, scientists now think, is that some of the Homo erectus ...

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