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JANUARY 17, 2000 VOL. 155 NO. 2

Up From the Apes
Remarkable new evidence is filling in the story of how we became human

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Despite the protests of creationists and their intellectual allies, and the occasional attempts by American state school boards to expunge evolution from the curriculum, science has long taught that human beings are just another kind of animal, but most of the time this seems like a technicality. It's not just the obvious differences--language, civilization, technology--that set us apart. Even basic biology suggests that humanity has special status. Virtually every other type of animal comes in multiple varieties: dozens of species of monkeys, antelopes, whales and hawks walk, swim or fly the earth, to say nothing of beetles, whose hundreds of thousands of species inspired biologist J.B.S. Haldane's famous quip that God must have had "an inordinate fondness" for them. Even our closest kin, the great apes, fall into four species, divided into several subspecies.

Cover: Up From the Apes
Remarkable new evidence is filling in the story of how we became human

Rewriting Prehistory
A team of researchers concludes that Chinese, like everyone else, came out of Africa

Tibet: Thunder Out of China
One of Tibet's holiest figures flees Beijing's control and slips across the border to be with the Dalai Lama

India: Fallout from Flight 814
The aftermath of the Indian Airlines hijacking suggests that tension over Kashmir is getting worse

Who Was That Special Passenger?
As clashes between Muslims and Christians escalate in the far-flung Moluccas, many wonder if anyone's in charge in Jakarta

Indonesia: Chaos in the Islands
Little did the hijackers know that one of the hostages sitting in economy class could have effortlessly written them a check for $200 million

Japan: Fighting for Wartime Retribution
Asians who toiled as slave laborers for Imperial Japan sue their corporate abusers

Thailand: Nothing to Trumpet About
Starving in the villages, unwelcome in the cities, Thailand's hard-working national symbol, the elephant, has no place to call home

But there's now only one species of human on the planet, and in the simplified view of evolution most of us have, that's all there has ever been. A few million years ago, most of us think, the half-ape known as Lucy appeared in Africa; eventually she begat a less apelike creature, who evolved in turn into something even more humanlike. Finally, after a few more begettings, Homo sapiens appeared. Except for that odd side branch known as the Neanderthals, the path from proto-apes to modern humans is commonly seen as a succession of new and improved species taking the place of worn-out evolutionary clunkers.

It's a satisfying, if slightly chauvinistic tale, but experts in human evolution have known for years that it is dead wrong. The evolution of a successful animal species almost always involves trial and error, false starts and failed experiments. "Humans are no exception to this," says anthropologist Ian Tattersall of the American Museum of Natural History in New York City, "no matter what we like to think."

True, we're descended from a creature that split off from the apes millions of years ago. But subsequent events were hardly a steady march from primitivism to perfection. Human evolution more nearly resembled an elimination tournament. At just about any given moment in prehistory, our family tree included several species of hominids--erect, upright-walking primates. All were competitors in an evolutionary struggle from which only one would ultimately emerge. Then came yet another flowering of species that would compete for survival. Neanderthals simply represented the most recent version of that contest. And while we'd find it bizarre to share our world with another human species, the fact that we've been alone since the Neanderthals vanished some 30,000 years ago is an evolutionary aberration.

The notion that multiple human species are the norm, not the exception, has only got stronger with a series of major scientific discoveries. Since 1994, four new species of hominid have been added to the human family tree, with the latest announced just a few months ago. These date from 800,000 years ago all the way back to 4.4 million years B.P. (before the present).

Scientists have also unearthed new fossils of known species. This should help them trace the complex relations among our sundry ancestors. One remarkable skeleton, announced last spring, suggests that modern humans and Neanderthals may even have mated successfully. And new evidence of stone-tool use, dating as far back as 2.5 million years, has provided tantalizing clues to how our forebears thought and behaved.

These discoveries not only further confirm that multiple hominid species are the rule but also bring us much closer to understanding the ultimate mysteries of human evolution: What were the changes that led to modern humans? When did these changes take place, and why? And perhaps most intriguing, will we continue to evolve, or has Homo sapiens (wise man) made evolution obsolete?

While all the answers won't be in for some time, experts have identified several key transitions in our evolutionary chronicle. The first, which happened around the time we diverged from the apes, between 6 million and 4 million years ago, was the development of bipedalism--two-legged walking rather than the kind of locomotion Tarzan learned from his adoptive ape family.

The second, which occurred perhaps 2.5 million years B.P., was the invention of toolmaking--the purposeful crafting of stone implements rather than just picking up handy rocks--and the transition to meat eating. Then, somewhere between 2 million and 1 million years ago, came the dramatic growth of the brain and our ancestors' first emergence from Africa. Finally, just a few tens of thousands of years ago, our own species learned to use that powerful organ for abstract thought, which quickly led to art, music, language and all the other skills that have enthroned humans as the unchallenged rulers of their planet.

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