One Earth, Many Bloods (The Astonishing Story of How Humanity Populated a Planet)

One Earth, Many Bloods

(The Astonishing Story of How Humanity Populated a Planet)

By Ginawang | The Besao B/Vlogger

There is a mountain in Africa that nobody alive today has ever seen. It existed roughly 70,000 years ago, somewhere in what is now Ethiopia or perhaps the Great Rift Valley, and on its slopes there lived a population of human beings so small, so pressed against extinction, that modern geneticists estimate the entire breeding pool may have numbered no more than a few thousand individuals. They were not yet Chinese. They were not yet European. They were not yet Igorot, or Zulu, or Maya, or Inuit. They were simply human, shivering and hungry and achingly alive, and from that impossibly narrow genetic bottleneck every single person now walking the surface of the earth descended.

This is the story of what happened next. It is the greatest adventure story ever lived.

Before the Story Begins, There Were Other Stories

To understand where modern humans came from, we have to understand what was already here when we arrived. The planet was not empty. For millions of years before Homo sapiens ever drew breath, the earth had been running an extraordinary experiment in human-shaped creatures, and by the time our ancestors were ready to spread across the world, they were walking into a landscape already haunted by our evolutionary cousins.

The oldest ancestor recognizable as belonging to our lineage is Australopithecus, a genus that walked upright in Africa roughly four million years ago but still carried a brain closer in size to a chimpanzee's than to ours. From that root, evolution branched outward in multiple directions simultaneously, producing creatures that seem to blur the line between animal and person. Homo habilis appeared roughly 2.4 million years ago, small and clever, capable of shaping stone into tools. Homo erectus arrived around 1.9 million years ago and was the first of our lineage bold enough to leave Africa entirely. Homo erectus walked into Asia, reached the Indonesian archipelago, and survived in isolated pockets for an almost incomprehensible span of time. Some of their descendants, stranded on the island of Flores in Indonesia, shrank across generations in response to the island's limited resources and became the remarkable Homo floresiensis, a tiny hominin standing barely a meter tall, who persisted until perhaps 50,000 years ago, possibly overlapping in time with the first Homo sapiens who reached that region.

In Europe and western Asia, a separate lineage was flourishing. The Neanderthals, Homo neanderthalensis, were not the brutish cavemen of popular imagination. They were large-brained, strong, emotionally complex beings who buried their dead, created pigments that suggest body decoration, and cared for injured members of their groups. They had held Europe against ice ages for hundreds of thousands of years when Homo sapiens finally arrived on their doorstep. And in the cold highlands of Siberia, a third group was living quietly, known today only because a young girl died in a cave called Denisova roughly 50,000 years ago and left behind a finger bone from which scientists, astonishingly, were able to extract DNA. These were the Denisovans, a population as genetically distinct from Neanderthals as Neanderthals were from us.

What happened when all these lineages met is one of the most consequential stories in the history of life. They did not simply war. They interbred. The evidence is written inside the genomes of living people right now. Every person of non-African descent carries roughly one to four percent Neanderthal DNA. People whose ancestors came from East Asia, Southeast Asia, and the Pacific Islands, including the Austronesian peoples from whom many Igorot lineages partly descend, carry an additional layer of Denisovan ancestry. The Indigenous peoples of Australia and Papua New Guinea carry the highest Denisovan percentage of any living population, up to six percent. The people of the Philippines, including groups in the highlands of Luzon, carry traces of a distinct and as-yet-unnamed Denisovan-related lineage, sometimes referred to as the "Luzon Denisovans" in preliminary research.

We did not replace these other humans. We absorbed them. And then we spread.

The First Departure (Out of Africa and Into the World)

The evidence from genetics and archaeology now converges on a picture of modern humans beginning to press out of Africa somewhere between 70,000 and 60,000 years ago, following what researchers call the Southern Coastal Route. This was not a deliberate migration in any conscious sense. It was drift, curiosity, the slow following of game and shorelines across generations so gradual that no individual would have understood they were participating in the colonization of the planet. People walked because the next valley looked promising. Children were born who had never seen the valley their grandparents came from. Over hundreds of generations, this meandering became history.

The first great wave moved along coastlines, following the edges of the Indian Ocean. By approximately 65,000 years ago, anatomically modern humans had reached the landmass now broken into Australia, Papua New Guinea, and the surrounding islands. At that time, sea levels were lower and these territories were joined into a single continent that researchers call Sahul. The people who settled Sahul crossed open water to do it, navigating stretches of ocean that required deliberate seafaring even during periods of low sea level. This makes the Aboriginal Australians and the Papuans the descendants of the most ancient continuous civilization outside of Africa on earth. Their ancestors did not merely stumble off a land bridge. They sailed.

These founding populations developed in relative isolation for tens of thousands of years, and their extraordinary genetic divergence from other modern human lineages reflects that deep separation. When Europeans finally made contact with Aboriginal Australians in the eighteenth century, they were meeting people whose ancestors had been separate from the European lineage for roughly 60,000 years. Seen in that light, the assumption of European cultural superiority was not merely morally wrong. It was scientifically absurd.

Africa Did Not Empty (The Origin of Sub-Saharan African Peoples)

One of the greatest misunderstandings in popular discourse about human origins is the idea that "Out of Africa" means Africa was left behind. It was not. It remained, as it had always been, the heartland of human diversity.

Because the human species originated in Africa and because populations that stayed had more time to diverge from each other than populations that left, Africa today contains more human genetic diversity than the rest of the world combined. The !Kung San people of southern Africa, the Hadza of Tanzania, and the Sandawe people carry some of the most ancient genetic lineages of any living humans. The Yoruba of Nigeria, the Kikuyu of Kenya, the Zulu of South Africa, the Fula of the Sahel are all the descendants of populations that never left and whose ancestors were anatomically modern humans in Africa for hundreds of thousands of years before the Out of Africa migration even began.

When people ask "why are there black people in Africa," the answer they are really seeking is an explanation for dark skin pigmentation, and the explanation is elegantly simple. Human beings evolved in equatorial Africa under intense ultraviolet radiation. Dark skin, produced by high concentrations of melanin in the epidermis, is an adaptation that protects the body from UV damage, prevents folate destruction in the blood, and reduces the risk of skin cancer. It is not a marker of racial identity in any meaningful biological sense. It is a geographic adaptation as logical as the thick fur of a Siberian fox. The human lineages that migrated out of Africa into higher latitudes, where sunlight was weaker and vitamin D synthesis required lighter skin to absorb what little UV light existed, gradually depigmented across thousands of years of natural selection. Dark skin is not primitive. It is optimal for life near the equator, and it is the ancestral condition of our entire species.

The diversity of peoples now living across the African continent represents tens of thousands of years of internal migration, cultural development, and civilizational achievement, including the Nile Valley civilizations, the kingdoms of Mali and Songhai, the architectural sophistication of Great Zimbabwe, and the metallurgical traditions of the Nigerian Nok culture, all of which predate or parallel the developments Europeans would later describe as exclusively their own.

Into the Cold (The Peopling of Europe and the Aryan Question)

As modern humans moved through the Middle East and into Central Asia around 50,000 to 45,000 years ago, one branch turned westward toward Europe. They arrived in a continent already populated by Neanderthals, and what followed was a process that lasted tens of thousands of years. By approximately 40,000 years ago, Homo sapiens were producing the extraordinary cave art of Chauvet and Lascaux in what is now France, paintings so sophisticated and emotionally resonant that they stopped art historians in their tracks when first discovered. The creators of these paintings were the Cro-Magnons, fully modern humans who had interbred with Neanderthals during their westward journey and now carried those genetic traces as they painted ochre horses on limestone walls.

The history of Europe after that initial settlement is a layered story of successive waves of migration and mixing. The original hunter-gatherer populations were later joined by early farmers who arrived from Anatolia beginning around 9,000 years ago, bringing agriculture, domestic animals, and new genetic lineages into the continent. Then, roughly 4,500 years ago, a third great wave arrived from the Pontic-Caspian Steppe, the vast grasslands north of the Black Sea, and this arrival is what modern historians and geneticists connect to the spread of Indo-European languages and what nineteenth-century scholars problematically called the "Aryan" migrations.

The word "Aryan" deserves careful examination, because it was one of the most catastrophically misappropriated terms in the history of science. The word itself is ancient and honorable, derived from a Sanskrit root meaning "noble" or "civilized," and it was used in the Vedic texts of ancient India and in the Avestan texts of ancient Persia to describe a cultural and linguistic community, not a biological race. The Proto-Indo-European speakers who spread westward into Europe and southward into the Indian subcontinent and Iran from the Pontic Steppe carried with them a family of related languages that would eventually become Sanskrit, Greek, Latin, Persian, Celtic, Germanic, Slavic, and Baltic. These are the Indo-European languages, and the people who spoke their common ancestor are sometimes called Aryans in the original sense.

When nineteenth-century European nationalists and, later, Nazi ideologues seized upon the term and transformed it into a biological category denoting a superior white race, they were committing both a scientific fraud and a moral catastrophe. The actual Steppe populations who spread Indo-European languages were genetically mixed, showing ancestry from Eastern European hunter-gatherers, early Caucasian farmers, and even populations with ancestry reaching back toward ancient Iran and South Asia. They were also predominantly dark-haired and likely olive-skinned. The blond, blue-eyed "Aryan" of Nazi mythology had no genetic basis. It was a fantasy built on top of a linguistic category and used to justify extermination.

The Indo-European migrations did reshape Eurasia profoundly. Languages related to each other because of this expansion are spoken today from Ireland to Bangladesh. But the people who speak them are not a race. They are the descendants of millennia of intermarriage between the incoming Steppe populations and the farmers and hunter-gatherers already present across the landscape.

East of Eden (The Peopling of Asia and the Origins of East Asian Peoples)

As the ancestral human population moved through Central Asia, one great branch turned eastward, eventually populating the vast territories of what is now East and Southeast Asia. The ancestors of the East Asian peoples, including the Chinese, Japanese, Korean, and related groups, diverged from the populations that would eventually become South Asians and Europeans somewhere between 40,000 and 30,000 years ago, and they developed in relative geographic isolation long enough to acquire the physical characteristics that define what we loosely call East Asian appearance.

The epicanthic fold of the eye, common across East Asian populations, appears to be an adaptation to cold climates and the intense UV glare of open tundra and grassland. The relative reduction in body hair and the distribution of subcutaneous fat that characterizes many East Asian bodies may also reflect adaptation to cold. The straightness of East Asian hair is governed by the cross-sectional shape of the hair follicle, which differs from the more oval follicles of African hair and the elliptical follicles of European hair. These are variations on the human theme, produced by tens of thousands of years of living in different environments.

The people who would become the founding populations of East Asian civilization were not always where they are now. Multiple waves of migration across East and Southeast Asia reshaped the genetic landscape dramatically. The expansion of agriculture from the Yangtze River basin and the Yellow River valley roughly 7,000 to 5,000 years ago sent Neolithic farming populations southward and westward, absorbing and displacing earlier hunter-gatherer groups across the continent. The ancestors of many Southeast Asian ethnic groups, and indeed the ancestors of the Austronesian peoples who eventually colonized the Philippines, Taiwan, Indonesia, and the Pacific, were part of these southward-moving agricultural communities. The genetic and linguistic connections between the Tai-Kadai, Austronesian, and Hmong-Mien language families, all linked to this southward agricultural expansion, are still visible in the genomes of living people across the region today.

The Children of the Sea (Austronesian Expansion)

Among all the great human dispersals that followed the original Out of Africa migration, the Austronesian expansion stands as arguably the most breathtaking feat of organized human movement in the ancient world. Beginning roughly 5,500 years ago from the island of Taiwan, which genetics and linguistics now firmly identify as the Austronesian homeland, waves of ocean-going people spread first southward into the Philippines, then westward into Indonesia, then westward again across the Indian Ocean to Madagascar, and eastward across the largest ocean on the planet to reach every habitable island in the Pacific.

The details of this expansion are discussed at length in other essays in this series, but it is worth noting here that the Austronesian peoples did not spread into an empty world. When they reached the Philippines, they encountered populations already present for tens of thousands of years, the Negritos, who are the descendants of the ancient Out of Africa coastal migration that had reached Southeast Asia long before Austronesian farmers arrived. The Aeta, the Agta, the Ati, the Batak of the Philippines are the heirs of that original peopling, and they carry the Denisovan DNA admixture that marks their ancestors' ancient encounter with archaic hominins. When Austronesian farmers arrived, they did not replace these earlier populations. They mixed with them, producing the complex genetic mosaic that characterizes Filipino populations today and giving Cordillera highland groups like the i-Besao their layered heritage of deep antiquity and maritime civilization intertwined.

Crossing the Top of the World (The Peopling of the Americas)

The Americas were the last great inhabited landmasses to receive human settlers, and the story of how people got there is one of the most dramatic chapters in human prehistory.

Roughly 25,000 to 15,000 years ago, a population of people in northeastern Asia, carrying ancestry from both the ancient populations of Siberia and from East Asian-related groups, found themselves living on and near a landmass called Beringia. Today this land is underwater, drowned by the rising seas that followed the end of the last Ice Age, but for thousands of years it was a vast, grassy, cold but habitable landscape connecting what is now Russia to what is now Alaska. These people were not consciously crossing to a new continent. They were simply living on the Beringian landmass, following mammoth herds, harvesting the cold sea, surviving.

When the ice sheets that had blocked southward movement into the interior of North America began to melt, corridors opened. People moved through them. Within a geologically astonishing span of time, perhaps only a few thousand years, the descendants of those Beringian populations had reached the southernmost tip of South America, approximately 18,000 kilometers from the Alaskan entry point. They became the Clovis people of North America, the ancestors of the Ancestral Puebloans, the Mississippian mound builders, the Iroquois Confederacy, the Aztec and Maya civilizations, the Inca Empire, the Guaraní, the Mapuche, and hundreds of other distinct peoples. Genetics now confirms that the Indigenous peoples of the Americas all descend primarily from this founding Beringian population, with possible additional contributions from later coastal migrations that brought different Asian ancestry groups to South America.

The reason American Indians, as they were historically and inaccurately called, appear physically related to East Asian peoples is because they are. Their ancestors crossed out of northeastern Asia carrying the genetic signature of populations related to, though distinct from, modern East Asians. The epicanthic fold, the straight dark hair, the copper skin tones of many Indigenous American peoples are all reflections of that shared ancestry across the Bering land bridge.

What these peoples built in the Americas before European contact was staggering. Tenochtitlan, the Aztec capital on an artificial island in the middle of a lake in the Valley of Mexico, was one of the largest cities on earth in 1500, larger than London or Paris at the time. The Inca road network stretched over 40,000 kilometers through the Andes. The Maya independently developed a mathematical concept of zero. The Haudenosaunee Confederacy of the northeastern woodlands developed a system of representative democratic governance that some historians argue directly influenced the framers of the American Constitution. This was not a continent of people waiting to be discovered. It was a continent of civilizations with their own histories, philosophies, and futures, which were then catastrophically disrupted.

Masters of the Ice (The Inuit and Arctic Peoples)

If the Austronesian seafarers represent humanity's triumph over the open ocean, the Inuit and related Arctic peoples represent humanity's triumph over cold itself, and the story of how they came to occupy the snows is a story of technological genius.

The Inuit are not the descendants of the first people who crossed from Beringia into North America. They are a later, separate migration. The first people to cross into the Americas moved south, and their descendants became the many Indigenous peoples of North, Central, and South America. But a later migration, roughly 5,000 to 4,000 years ago, brought a different population across the Arctic and into the northernmost reaches of North America and Greenland. This group, called the Arctic Small Tool tradition or the Paleo-Eskimo people in archaeological literature, was distinct from both the earlier American migrants and from modern Inuit.

The ancestors of the modern Inuit, called the Thule people, migrated rapidly across the Arctic from Alaska to Greenland roughly 1,000 years ago, displacing and largely replacing the Paleo-Eskimo populations they encountered. Genetic research has shown that most modern Inuit trace the majority of their ancestry to this Thule migration, not to the earlier Paleo-Eskimo populations. The Thule people brought with them the technology that made Arctic survival not merely possible but genuinely comfortable- the dogsled, the kayak and umiak, the toggling harpoon for hunting sea mammals through ice, and the remarkable architectural knowledge embodied in the igloo, whose hemispherical shape and snow-block construction create interior temperatures that can sit as much as 40 degrees Celsius warmer than the outside air.

The human body of Arctic peoples also reflects millennia of natural selection for cold-weather survival. Inuit and related groups have a higher frequency of genetic variants that increase thermogenesis, the internal generation of body heat, and their metabolic processing of the fat-rich diet provided by seals, walruses, whales, and caribou is governed by genetic adaptations distinct from those of peoples adapted to carbohydrate-based agricultural diets. The compact, short-limbed body proportions of many Arctic peoples are not accidental. They minimize the surface area relative to body volume, reducing heat loss. Evolution was running a very specific program, and it produced a people perfectly shaped for a world of white silence.

The Story Written in Our Blood

What emerges from all of this, when you hold it together in the mind, is not a story of separate races occupying separate territories because they are fundamentally different. It is a story of one restless species, crossing ice fields and open oceans, breeding with archaic cousins, adapting to deserts and rainforests and tundra, diverging for tens of thousands of years in geographic isolation, and then reconnecting again in the great historical collisions of the last 500 years. The peoples of the earth are not different kinds of human being. They are the same human being, run through different environmental filters for different lengths of time, producing variations in skin tone and hair texture and metabolic chemistry that are, in the full scale of our shared history, astonishingly superficial.

The i-Besao of the Cordillera and the Inuit of Greenland share a common African ancestor from perhaps 70,000 years ago. The Yoruba of Nigeria and the Inca of Peru last shared a common population roughly 60,000 years before they first made contact with one another. An Aryan-speaking Vedic poet of ancient India and a Clovis hunter stalking mammoths in New Mexico were separated by 20,000 years and half a planet but traced their lineage back to the same small band of East Asian ancestors who split apart on the Eurasian steppe.

We were always one people. We spread, we changed, we forgot each other, and then we found each other again across ships and roads and eventually screens. The differences we see in the mirror are the record of that long journey. They are not walls. They are chapters in the same story, a story that began in Africa, ran through every climate zone on the planet, and is still being written today on every street corner where two people from different chapters of that journey decide to begin a chapter together.

The earth has one story, told in many languages, carried in many bodies, worshipped by many names. And all of it, all of us, grew from that one small, frightened, magnificent cluster of human beings who looked out from their mountain in Africa and decided to see what was on the other side.

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