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The First Human: The Race to Discover Our Earliest Ancestors - Hardcover

Gibbons, Ann

 
9780385512268: The First Human: The Race to Discover Our Earliest Ancestors
Hardcover
ISBN 10: 0385512260 ISBN 13: 9780385512268
Verlag: Bantam Doubleday Dell, 2006

Inhaltsangabe

This dynamic chronicle of the race to find the “missing links” between humans and apes transports readers into the highly competitive world of fossil hunting and into the lives of the ambitious scientists intent on pinpointing the dawn of humankind.
 
The quest to find where and when the earliest human ancestors first appeared is one of the most exciting and challenging of all scientific pursuits. The First Human is the story of four international teams obsessed with solving the mystery of human evolution and of the intense rivalries that propel them.
 
An award-winning science writer, Ann Gibbons introduces the various maverick fossil hunters and describes their most significant discoveries in Africa. There is Tim White, the irreverent and brilliant Californian whose team discovered the partial skeleton of a primate that lived more than 4.4 million years ago in Ethiopia. If White can prove that it was hominid—an ancestor of humans and not of chimpanzees or other great apes—he can lay claim to discovering the oldest known member of the human family. As White painstakingly prepares the bones, the French paleontologist Michel Brunet comes forth with another, even more startling find. Well known for his work in the most remote and hostile locations, Brunet and his team uncover a stunning skull in Chad that could set the date of the beginnings of humankind to almost seven million years ago. Two other groups—one led by the zoologist Meave Leakey, the other by the British geologist Martin Pickford and his partner, Brigitte Senut, a French paleontologist—enter the race with landmark discoveries of other fossils vying for the status of the first human ancestor.
 
Through scrupulous research and vivid first-person reporting, The First Human takes readers behind the scenes to reveal the intense challenges of fossil hunting on a grand competitive scale.

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Über die Autorin bzw. den Autor

ANN GIBBONS, the primary writer on human evolution for Science magazine for more than a decade, has taught science writing at Carnegie Mellon University. She has been a Knight Science Journalism Fellow at Massachusetts Institute of Technology and a Science Journalism Fellow at the Marine Biological Laboratory in Woods Hole, Massachusetts. She lives in Pittsburgh, Pennsylvania.

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CHAPTER ONE

AFRICAN TRAILBLAZERS

Most scientific problems are far better understood by studying their history than their logic.
-Ernst Mayr, evolutionary biologist

I was told as a young student not to waste my time searching for Early Man in Africa, since "everyone knew he had started in Asia."
-Louis Leakey, 1966

It was an October morning in 2003. Meave Leakey was driving from Nairobi north along the eastern wall of the Rift Valley in central Kenya, expertly weaving around potholes in the tarmac and dodging oncoming buses that played chicken with smaller vehicles to scare them out of their way. Trucks belched black smoke that stung her eyes, cyclists hitched rides up hills holding on to the backs of buses, and jam-packed public shuttles called matatus spent almost as much time passing each other as staying on their side of the two-lane road. As Meave negotiated this nerve-racking traffic on the Uplands Road between Nairobi and Nakuru, she calmly recounted the story of how the search for human ancestors began in eastern Africa. "Until the middle of 1959, only a few people seriously believed eastern Africa was a sensible place to look for the earliest human ancestors," she said.

This history is personal for her, because it is the saga of her husband's parents, Louis and Mary Leakey. This formidable pair was among the first to stake their careers on Africa as the birthplace of mankind. For three decades, their work in eastern Africa was an almost solitary pursuit. Even those researchers who found fossils of early ape-men in South Africa during that time had trouble convincing their European colleagues that these primitive fossils were ancestors of humans. Then, in 1959, Mary found a fossil in Olduvai Gorge, Tanzania, that would finally give the Leakeys the hard evidence they had long sought that early humans did indeed evolve in eastern Africa. Louis named the cranium, or partial skull, Zinjanthropus boisei--Zinj from an Arabic word for eastern Africa, anthropus from the Greek word for man, and boisei from Charles Boise, a London businessman who was their benefactor. Translated, the name is an assertion: "Man from Eastern Africa." And once the Man from Eastern Africa made his appearance, the push was on to find more extinct men and women. Soon, teams of French and American researchers headed to eastern Africa, like forty-niners to California during the gold rush. The fossils they found in the Great Rift Valley in the 1960s and 1970s soon made it known as the cradle of humanity.

But Louis's search for the missing link in eastern Africa had started more than thirty years earlier, right in the gullies and rock shelters alongside the Uplands Road where Meave was driving nearly eighty years later, high above the Great Rift Valley. In 1926, the first year that Louis worked in the area, the Uplands Road did not exist, and the trip from Nairobi in Louis's Model T Ford took a half day over muddy tracks. The air was so clear that Louis could see miles across the Great Rift Valley from his camp, down a slope covered with acacia trees and scrub brush to Lake Elmenteita, a shallow alkaline lake rimmed with the pink froth of flamingos. Bush babies, leopards, aardvarks, and ibises lived in the acacia woodlands near the shore, and a herd of hippos wallowed in the lake. Beyond the lake, the jagged calderas of several extinct volcanoes lined up to form the silhouette of a human figure that the local Masai tribesmen called Elngiragata Olmorani, for Sleeping Warrior. A few British settlers were staking out the Masai's traditional grazing grounds for homesteads for cattle ranches, but otherwise the area was still remote and primeval.

Today, Elmenteita is only an hour's drive beyond the shanty sprawl surrounding Nairobi, and much of the land around the lake is fenced in by private owners. The hippos are gone and the bush babies and a few remaining leopards have retreated to a wildlife sanctuary. But the view of the rift valley far below is still stunning, and Meave named the volcanoes visible in the distance as she searched for a familiar turnoff. Spotting it, she jostled down a dirt road, past a quarry where workers mined a crumbly white rock called diatomite, and pulled into a grassy driveway. The sign said: Kariandusi Museum, National Museums of Kenya. It did not look like much: a guard's hut and a whitewashed, single-room museum with some casts of skulls and an exhibit on the formation of the Great Rift Valley. It was clearly off the tourists' safari circuit.

A curator eventually appeared, delighted to find someone who wanted to tour the site on a Monday in October. He was even more surprised to find out that the tall woman with straight, silver-gray hair and hazel eyes spoke Swahili and was a member of the Leakey family--a name that is well-known in Kenya. At sixty-one, Meave had been here many times before and knew the history of Kariandusi by heart. She is long-legged and fit after a lifetime of hard work scrambling over rugged terrain for fossils, and she did not need a guide to lead her into the gulch. She let the curator show her the way to a series of steplike pits anyway, partly because she was curious to learn what he knew. He took her to the first pit, which was covered with a corrugated metal roof. Meave leaned over the rail and pointed to the dirt floor encrusted with hundreds of stone tools, most made of glassy black obsidian, the rock that comes from volcanic lava. There were tear-shaped hand axes, two-sided flakes, and even triplets of round stones that look like black billiard balls. "This is where it all began," said Meave. She was referring to Louis's search for early man in eastern Africa. These shiny black tools at Kariandusi were among the first hard evidence of a sophisticated ancient Stone Age culture in eastern Africa. They were made by people who left them on the shores of the lake almost 500,000 years ago, perhaps when they came to hunt wild animals that were quenching their thirst at dawn or dusk. She climbed down wooden stairs into a deep gully where an ibis was roosting in a tree. Meave remembered a photo from National Geographic that showed Louis bending over a cliff there, pointing to stone tools embedded in the wall. This was precisely the spot where Louis and his team found their first ancient hand axes in eastern Africa in 1929.

* * *

In 1871, less than sixty years earlier, Charles Darwin had proposed in The Descent of Man and Selection in Relation to Sex, that the earliest ancestors of humans probably lived on the African continent. But that prediction was based on absolutely no evidence from fossils. In fact, at the time only one fossil of another type of human being was known, and that was of a Neandertal that had lived in the Neander valley of Germany sometime in the past 70,000 years. Darwin chose Africa because humans' closest cousins in the animal kingdom--chimpanzees and gorillas--lived in Africa; therefore, he wrote, "it is more probable that our early progenitors lived on the African continent than elsewhere." But Darwin admitted that it was "useless to speculate on this subject," since an extinct European ape nearly as large as humans could also have given rise to humans.

That didn't stop Darwin's colleagues from conjecture. His friend and champion Thomas Henry Huxley (also known as Darwin's "bulldog") agreed that humans should be put in the same family as chimpanzees and gorillas, and enthusiastically promoted that view in debates and in his 1863 book Evidence as to Man's Place in Nature. (Darwin himself avoided dealing directly with the issue until 1871, when he published The Descent of Man.) But a contemporary and...

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Verlag
Bantam Doubleday Dell
Erscheinungsdatum
2006
Sprache
Englisch
ISBN 10 
0385512260
ISBN 13 
9780385512268
Einband
Gebundene Ausgabe
Anzahl der Seiten
306
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Verantwortliche Person
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