Aceson San Nicolas

About 100,000 years ago, a diverse group of hominids, or humanlike species, occupied Earth. By 30,000 years ago, however, only Homo sapiens—the most modern species—remained. One of the most hotly debated issues in paleoanthropology, the study of human origins, focuses on how Homo sapiens evolved to outlive the other hominids. The current best explanation for the beginning of modern humans is the Out of Africa model. This holds that Homo sapiens arose in Africa and gradually replaced hominid species in the other parts of the world to which they migrated.

To address the question of why our species survived, paleoanthropologists make certain assumptions about lifestyle and behavior based on fossil evidence. The fossil record shows that early Homo sapiens—who had a body plan more or less like our own—and Neanderthals (Homo neanderthalensis)—a separate species characterized by a large, low-sloping cranial vault and a short, robust skeleton—inhabited the same land at about the same time, between approximately 30,000 and 40,000 years ago.

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Both species developed hunting tools and used fire. But paleoanthropologists theorize that Homo sapien understanding of geography might have given them a decisive competitive advantage. Artifacts suggest that nearly all known early Homo sapien settlements were situated on hilltops and high ridges. Their ability to survey large areas of land from such vantage points would very likely have helped their hunting strategy. Neanderthals, on the other hand, lived in valleys that did not permit a clear view to the horizon.

Even though the Neanderthals may have arrived first on the scene, the more modern species, Homo sapiens, came out ahead in the competition for resources. Over a period of roughly 5,000 to perhaps 10,000 years, the Neanderthals were gradually displaced to remote areas like the British Isles, northern Germany, and southern Spain. About 30,000 years ago, they became extinct. While fossil evidence suggest that the Neanderthals may have adopted some of the technologies that made modern humans more effective hunters, recent DNA evidence suggests that Neanderthals and Homo sapiens did not interbreed.

Because Neanderthals did not contribute mitochondrial DNA to modern humans, they are most likely not our direct ancestors. This finding provides further support to the Out of Africa model For about 70,000 years, Neanderthals roamed Earth with modern Homo sapiens. Fossil evidence from the Middle East suggests that our ancestors not only lived at the same time as Neanderthals, but probably lived alongside them in some areas. So why are there no Neanderthals walking Earth today? Or are there?

For decades, the overwhelming scientific consensus has held that sometime between 100,000 and 50,000 years ago, Homo sapiens left Africa in search of more space and new habitats to exploit. En route, they inevitably met up with the Neanderthals occupying the Middle East and southern Europe. This “out of Africa” hypothesis, as it has come to be known, says that Neanderthals were no match for the better-adapted, quicker-witted Homo sapiens. They were out-competed, pushed out of their habitats, and ultimately driven to extinction by a superior species — ours.

End of story. The explanation is simple, plausible, and accepted by most scientists. But is it correct? Newly discovered evidence suggests another possibility, lending some credibility to a hypothesis that has languished in relative obscurity for as long as “out of Africa” has reigned. The “multiregional” hypothesis is the messy alternative. It says that pockets of Homo sapiens left Africa not in one large, unstoppable wave, but in smaller movements across many different regions.

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