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it wasn’t until 2017, when a group of Swedish archaeologists and geneticists extracted DNA from the remains, that the sex of the warrior indeed proved to be female.

In archaeology, as the researchers admitted, we can’t always know why a community buried someone with particular objects. And one female warrior does not mean that many women were leaders, just as the reign of Queen Elizabeth I was not part of a larger feminist movement.

These findings don’t reveal an ancient matriarchy. But neither do they reaffirm the idea of societies in which men dominate completely. What they indicate is a lot more mundane and relatable: Some women were warriors and leaders; many weren’t. There was inequality, but it wasn’t absolute, and there were a lot of shifts over time.

adolescents aren't reckless because they underestimate risks, but because they overestimate rewards—or, rather, find rewards more rewarding than adults do. The reward centers of the adolescent brain are much more active than those of either children or adults.

What teenagers want most of all are social rewards, especially the respect of their peers

Becoming an adult means leaving the world of your parents and starting to make your way toward the future that you will share with your peers. Puberty not only turns on the motivational and emotional system with new force, it also turns it away from the family and toward the world of equals.

The second crucial system in our brains has to do with control; it channels and harnesses all that seething energy. In particular, the prefrontal cortex reaches out to guide other parts of the brain, including the parts that govern motivation and emotion. This is the system that inhibits impulses and guides decision-making, that encourages long-term planning and delays gratification.

Today's adolescents develop an accelerator a long time before they can steer and brake.

Expertise comes with experience.

In gatherer-hunter and farming societies, childhood education involves formal and informal apprenticeship. Children have lots of chances to practice the skills that they need to accomplish their goals as adults, and so to become expert planners and actors.

In the past, to become a good gatherer or hunter, cook or caregiver, you would actually practice gathering, hunting, cooking and taking care of children all through middle childhood and early adolescence—tuning up just the prefrontal wiring you'd need as an adult. But you'd do all that under expert adult supervision and in the protected world of childhood

In contemporary life, the relationship between these two systems has changed dramatically. Puberty arrives earlier, and the motivational system kicks in earlier too. At the same time, contemporary children have very little experience with the kinds of tasks that they'll have to perform as grown-ups.

The experience of trying to achieve a real goal in real time in the real world is increasingly delayed, and the growth of the control system depends on just those experiences.

This control system depends much more on learning. It becomes increasingly effective throughout childhood and continues to develop during adolescence and adulthood, as we gain more experience.

An ever longer protected period of immaturity and dependence—a childhood that extends through college—means that young humans can learn more than ever before. There is strong evidence that IQ has increased dramatically as more children spend more time in school

children know more about more different subjects than they ever did in the days of apprenticeships.

Wide-ranging, flexible and broad learning, the kind we encourage in high-school and college, may actually be in tension with the ability to develop finely-honed, controlled, focused expertise in a particular skill, the kind of learning that once routinely took place in human societies.

this new explanation based on developmental timing elegantly accounts for the paradoxes of our particular crop of adolescents.

First, experience shapes the brain.

the brain is so powerful precisely because it is so sensitive to experience. It's as true to say that our experience of controlling our impulses make the prefrontal cortex develop as it is to say that prefrontal development makes us better at controlling our impulses

Second, development plays a crucial role in explaining human nature

there is more and more evidence that genes are just the first step in complex developmental sequences, cascades of interactions between organism and environment, and that those developmental processes shape the adult brain. Even small changes in developmental timing can lead to big changes in who we become.

Brain research is often taken to mean that adolescents are really just defective adults—grown-ups with a missing part.

But the new view of the adolescent brain isn't that the prefrontal lobes just fail to show up; it's that they aren't properly instructed and exercised

Instead of simply giving adolescents more and more school experiences—those extra hours of after-school classes and homework—we could try to arrange more opportunities for apprenticeship

Summer enrichment activities like camp and travel, now so common for children whose parents have means, might be usefully alternated with summer jobs, with real responsibilities.

this might explain why it is relative, rather than absolute, inequality that matters so much to people today. In modern Western society, when even relatively poor people have access to transport, refrigeration, entertainment, shoes and plentiful food, you might expect that inequality would be less resented than a century ago—when none of those things might come within the reach of a poor person. What does it matter if there are people who can afford private jets and designer dresses? But clearly that isn't how people think. They resent inequality in luxuries just as much if not more than inequality in necessities. They dislike (and envy) conspicuous consumption, even if it impinges on them not at all. What hurts is not that somebody is rich, but that he is richer.

we can trace the major disasters of 20th century politics to the impeccably optimistic doctrines of Marx, Lenin, Mao, and the many others for whom progress was the inevitable tendency of history. Pessimism, so obviously vindicated in retrospect, is almost always ineffective at the time. Why is this?

Our approaches to questions of that kind have been strongly influenced in recent years by evolutionary psychology, which tells us that we are endowed with traits of character and patterns of feeling that were “adaptive” in the conditions from which human societies first emerged. And what was adaptive then might be profoundly maladaptive today, in the mass societies that we ourselves have created. It was adaptive in those small bands of hunter-gatherers to join the crowd, to persecute the doubter, to go cheerfully forward against the foe. And from these traits have sprung certain patterns of thinking that serve the vital purpose of preventing people from perceiving the truth, when the truth will discourage them.

The existence of the long-lived words suggests there was a “proto-Eurasiatic” language that was the common ancestor to about 700 contemporary languages that are the native tongues of more than half the world’s people.

In all, “proto-Eurasiatic” gave birth to seven language families. Several of the world’s important language families, however, fall outside that lineage, such as the one that includes Chinese and Tibetan; several African language families, and those of American Indians and Australian aborigines.

For Bronowski, science and art were two neighboring mighty rivers that flowed from a common source: the human imagination.

For Dr. Bronowski, there was no absolute knowledge and anyone who claims it — whether a scientist, a politician or a religious believer — opens the door to tragedy. All scientific information is imperfect and we have to treat it with humility. Such, for him, was the human condition.

This is the condition for what we can know, but it is also, crucially, a moral lesson. It is the lesson of 20th-century painting from Cubism onwards, but also that of quantum physics. All we can do is to push deeper and deeper into better approximations of an ever-evasive reality

Errors are inextricably bound up with pursuit of human knowledge, which requires not just mathematical calculation but insight, interpretation and a personal act of judgment for which we are responsible.

The emphasis on the moral responsibility of knowledge was essential for all of Dr. Bronowski’s work. The acquisition of knowledge entails a responsibility for the integrity of what we are as ethical creatures.

Dr. Bronowski insisted that the principle of uncertainty was a misnomer, because it gives the impression that in science (and outside of it) we are always uncertain. But this is wrong. Knowledge is precise, but that precision is confined within a certain toleration of uncertainty.

Pursuing knowledge means accepting uncertainty. Heisenberg’s principle has the consequence that no physical events can ultimately be described with absolute certainty or with “zero tolerance,” as it were. The more we know, the less certain we are.

Our relations with others also require a principle of tolerance. We encounter other people across a gray area of negotiation and approximation. Such is the business of listening and the back and forth of conversation and social interaction.

For Dr. Bronowski, the moral consequence of knowledge is that we must never judge others on the basis of some absolute, God-like conception of certainty. All knowledge, all information that passes between human beings, can be exchanged only within what we might call “a play of tolerance,” whether in science, literature, politics or religion.

The play of tolerance opposes the principle of monstrous certainty that is endemic to fascism and, sadly, not just fascism but all the various faces of fundamentalism. When we think we have certainty, when we aspire to the knowledge of the gods, then Auschwitz can happen and can repeat itself.

The pursuit of scientific knowledge is as personal an act as lifting a paintbrush or writing a poem, and they are both profoundly human. If the human condition is defined by limitedness, then this is a glorious fact because it is a moral limitedness rooted in a faith in the power of the imagination, our sense of responsibility and our acceptance of our fallibility. We always have to acknowledge that we might be mistaken.

The social welfare system is the modern system for redistributing resources,”

early man regularly experienced hunger, and when times were especially lean, he had to convince other group members to share their bounty.

 foundations of social welfare attitudes in an unusual place: among our hunter-gatherer ancestors

To the authors, this indicated that the hungrier subjects were, essentially, bigger fans of sharing society’s resources, and they wanted to remind others about the importance of redistribution.

That is, the hungrier people liked the idea of encouraging others to share, but they didn’t actually want to be the ones doing the sharing

ast studies from the same authors have also shown that people who are in a physically weaker situation tend to support wealth redistribution. Voters were more likely to be supportive of welfare policies if they were asked before lunchtime, as opposed to after, for example. Among rich men, those with smaller biceps were more likely to be open to wealth redistribution. (The opposite was true for poor men).

Granted, these studies were small, and they were performed in Denmark, which already has a more generous social welfare net that the U.S. does, so they can’t be applied directly.

“It would be a mistake to jump and say that dogs were domesticated in Europe and not anywhere else,” he said. “We know pigs were domesticated independently in China and Turkey, so there’s no thinking that dog domestication had to happen in just one place.”

human beings evolved big brains not to understand the world, but to understand each other.

not only did the brains of the mental athletes appear anatomically indistinguishable from those of the control subjects, but on every test of general cognitive ability, the mental athletes’ scores came back well within the normal range.

There was, however, one telling difference between the brains of the mental athletes and those of the control subjects. When the researchers looked at the parts of the brain that were engaged when the subjects memorized, they found that the mental athletes were relying more heavily on regions known to be involved in spatial memory.

just about anything could be imprinted upon our memories, and kept in good order, simply by constructing a building in the imagination and filling it with imagery of what needed to be recalled. This imagined edifice could then be walked through at any time in the future. Such a building would later come to be called a memory palace.

Memory training was considered a centerpiece of classical education in the language arts, on par with grammar, logic and rhetoric. Students were taught not just what to remember but how to remember it. In a world with few books, memory was sacrosanct.

In his essay “First Steps Toward a History of Reading,” Robert Darnton describes a switch from “intensive” to “extensive” reading that occurred as printed books began to proliferate.

Until relatively recently, people read “intensively,” Darnton says. “They had only a few books — the Bible, an almanac, a devotional work or two — and they read them over and over again, usually aloud and in groups, so that a narrow range of traditional literature became deeply impressed on their consciousness.” Today we read books “extensively,” often without sustained focus, and with rare exceptions we read each book only once. We value quantity of reading over quality of reading.

“Rhetorica ad Herennium” underscores the importance of purposeful attention by making a distinction between natural memory and artificial memory:

Our hunter-gatherer ancestors didn’t need to recall phone numbers or word-for-word instructions from their bosses or the Advanced Placement U.S. history curriculum or (because they lived in relatively small, stable groups) the names of dozens of strangers at a cocktail party. What they did need to remember was where to find food and resources and the route home and which plants were edible and which were poisonous

What distinguishes a great mnemonist, I learned, is the ability to create lavish images on the fly, to paint in the mind a scene so unlike any other it cannot be forgotten. And to do it quickly. Many c

the three stages of acquiring a new skill. During the first phase, known as the cognitive phase, we intellectualize the task and discover new strategies to accomplish it more proficiently. During the second

Wu wei is integral to romance, religion, politics and commerce. It’s why some leaders have charisma and why business executives insist on a drunken dinner before sealing a deal.

the quest for wu wei has been going on ever since humans began living in groups larger than hunter-gathering clans. Unable to rely on the bonds of kinship, the first urban settlements survived by developing shared values, typically through religion, that enabled people to trust one another’s virtue and to cooperate for the common good.

But there was always the danger that someone was faking it and would make a perfectly rational decision to put his own interest first if he had a chance to shirk his duty.

To be trusted, it wasn’t enough just to be a sensible, law-abiding citizen, and it wasn’t even enough to dutifully strive to be virtuous. You had to demonstrate that your virtue was so intrinsic that it came to you effortlessly.

the discovery in 1993 of bamboo strips in a tomb in the village of Guodian in central China. The texts on the bamboo, composed more than three centuries before Christ, emphasize that following rules and fulfilling obligations are not enough to maintain social order.

These texts tell aspiring politicians that they must have an instinctive sense of their duties to their superiors: “If you try to be filial, this not true filiality; if you try to be obedient, this is not true obedience. You cannot try, but you also cannot not try.”

is that authentic wu wei? Not according to the rival school of Taoists that arose around the same time as Confucianism, in the fifth century B.C. It was guided by the Tao Te Ching, “The Classic of the Way and Virtue,” which took a direct shot at Confucius: “The worst kind of Virtue never stops striving for Virtue, and so never achieves Virtue.”

Through willpower and the rigorous adherence to rules, traditions and rituals, the Confucian “gentleman” was supposed to learn proper behavior so thoroughly that it would eventually become second nature to him.

Taoists did not strive. Instead of following the rigid training and rituals required by Confucius, they sought to liberate the natural virtue within. They went with the flow. They disdained traditional music in favor of a funkier new style with a beat. They emphasized personal meditation instead of formal scholarship.

Variations of this debate would take place among Zen Buddhist, Hindu and Christian philosophers, and continue today among psychologists and neuroscientists arguing how much of morality and behavior is guided by rational choices or by unconscious feelings.

“Psychological science suggests that the ancient Chinese philosophers were genuinely on to something,” says Jonathan Schooler, a psychologist at the University of California, Santa Barbara. “Particularly when one has developed proficiency in an area, it is often better to simply go with the flow. Paralysis through analysis and overthinking are very real pitfalls that the art of wu wei was designed to avoid.”

Before signing a big deal, businesspeople often insist on getting to know potential partners at a boozy meal because alcohol makes it difficult to fake feelings.

Some people, like politicians and salespeople, can get pretty good at faking spontaneity, but we’re constantly looking for ways to expose them.

However wu wei is attained, there’s no debate about the charismatic effect it creates. It conveys an authenticity that makes you attractive, whether you’re addressing a crowd or talking to one person.

what’s the best strategy for wu wei — trying or not trying? Dr. Slingerland recommends a combination. Conscious effort is necessary to learn a skill, and the Confucian emphasis on following rituals is in accord with psychological research showing we have a limited amount of willpower. Training yourself to follow rules automatically can be liberating, because it conserves cognitive energy for other tasks.

He likes the compromise approach of Mencius, a Chinese philosopher in the fourth century B.C. who combined the Confucian and Taoist approaches: Try, but not too hard.

“But in many domains actual success requires the ability to transcend our training and relax completely into what we are doing, or simply forget ourselves as agents.”

The sprouts were Mencius’ conception of wu wei: Something natural that requires gentle cultivation. You plant the seeds and water the sprouts, but at some point you need to let nature take its course. Just let the sprouts be themselves.

Smith had a particular example in mind when he talked about market integration between continents: Europe and America.

Kevin O’Rourke and Jeffrey Williamson argued in a 2002 paper that globalisation only really began in the nineteenth century when a sudden drop in transport costs allowed the prices of commodities in Europe and Asia to converge

But there is one important market that Mssrs O’Rourke and Williamson ignore in their analysis: that for silver. As European currencies were generally based on the value of silver, any change in its value would have had big effects on the European price level.

The impact of what historians have called the resulting “price revolution” dramatically changed the face of Europe. Historians attribute everything from the dominance of the Spanish Empire in Europe to the sudden increase in witch hunts around the sixteenth century to the destabilising effects of inflation on European society. And if it were not for the sudden increase of silver imports from Europe to China and India during this period, European inflation would have been much worse than it was. Price rises only stopped in about 1650 when the price of silver coinage in Europe fell to such a low level that it was no longer profitable to import it from the Americas.

The German historical economist, Andre Gunder Frank, has argued that the start of globalisation can be traced back to the growth of trade and market integration between the Sumer and Indus civilisations of the third millennium BC. Trade links between China and Europe first grew during the Hellenistic Age, with further increases in global market convergence occuring when transport costs dropped in the sixteenth century and more rapidly in the modern era of globalisation, which Mssrs O’Rourke and Williamson describe as after 1750.

it is clear that globalisation is not simply a process that started in the last two decades or even the last two centuries. It has a history that stretches thousands of years, starting with Smith’s primitive hunter-gatherers trading with the next village, and eventually developing into the globally interconnected societies of today. Whether you think globalisation is a “good thing” or not, it appears to be an essential element of the economic history of mankind.

“We have a propensity to overcategorize things as disorders in the West,” said David Samson, an author of the study and an assistant professor of anthropology at the University of Toronto. “It might help elderly individuals to know changes they’re experiencing have an evolutionary reason.”

“The variation may be partially explained by genetics,” she said, “but there are environmental conditions too.” As people age, their social needs and level of activity change, potentially affecting their sleep patterns.

there is evidence of a genetic link, she added, pointing out that sleep quality declined among the older Hadza even while they remained active hunters and gatherers.

 The problem is that we humans didn’t evolve to live in the world in which we find ourselves.  As the social scientists Leda Cosmides and John Tooby put it, the human mind was “designed to solve the day-to-day problems of our hunter-gatherer ancestors. These stone age priorities produced a brain far better at solving some problems than others.” 

there are four failings common to human beings as a result of our Stone-Age brain that hinder us in politics.

why are we this way?  Science suggests that one reason is that we evolved to win in social settings and in such situations the truth doesn't matter as much as sheer doggedness

Second, we find it hard to size up politicians correctly.  The reason for this is that we rely on instant impressions. 

This stops voters from worrying that they need to bolster their impressions by consulting experts and reading news stories from a broad array of ideological viewpoints.  Why study when you can rely on your gut instinct?

Third, we aren’t inclined to reward politicians who tell us hard truths.

First, most people find it easy to ignore politics because it usually involves people they don’t know.  As human beings we evolved to care about people in our immediate vicinity.  Our nervous system kicks into action usually only when we meet people face-to-face

 This has left millions of voters on their own.  Lacking information, millions do what you would expect.  They go with their gut

most of the time we return to a state of well-being by simply ignoring the evidence we find discomforting.  This is known as Disconfirmation Bias and it afflicts all of us

Fourth, we frequently fail to show empathy in circumstances that clearly cry out for it.

We evolved to show empathy for people we know.  It takes special effort to empathize with people who don’t dress like us or look like us.

long-term we need to teach voters not to trust their instincts in politics because our instincts often don’t work.

Doing politics in a modern mass democracy, in other words, is an unnatural act.

Teaching this lesson doesn’t sound like a job for historians, but in one way it is.  Studying history is all about putting events into context. And as it turns out, voters need to learn the importance of context.

Given the mismatch between our Stone-Age brain and the problems we face in the 21st century, we should only trust our political instincts when those instincts are serviceable in a modern context.  If they aren’t (and most of the time they aren't), then higher order cognitive thinking is required.

Just why mass ignorance seems to be afflicting our politics at this moment is a complicated question.  But here again history can be helpful.  The answer seems to be that the institutions voters formerly could turn to for help have withered.

We don't want the truth to prevail, as Harvard's Steven Pinker informs us, we want our version of the truth to prevail, for in the end what we're really concerned with is maintaining our status or enhancing it.

ut cultural norms can be established that help us overcome our natural inclinations.

don’t have much confidence that people in general will be willing on their own to undertake the effort.

Shigir Idol

Dug out of a peat bog by gold miners in 1890, the relic, or what’s left of it, is carved from a great slab of freshly cut larch.

Scattered among the geometric patterns (zigzags, chevrons, herringbones) are eight human faces, each with slashes for eyes that peer not so benignly from the front and back planes.

“Whether it screams or shouts or sings, it projects authority, possibly malevolent authority. It’s not immediately a friend of yours, much less an ancient friend of yours.”

In archaeology, portable prehistoric sculpture is called “mobiliary art.”

The statue’s age was a matter of conjecture until 1997, when it was carbon-dated by Russian scientists to about 9,500 years old, an age that struck most scholars as fanciful.

The statue was more than twice as old as the Egyptian pyramids and Stonehenge, as well as, by many millenniums, the first known work of ritual art.

A new study that Dr. Terberger wrote with some of the same colleagues in Quaternary International, further skews our understanding of prehistory by pushing back the original date of the Shigir Idol by another 900 years, placing it in the context of the early art in Eurasia.

“During the period of rapid cooling from about 10,700 B.C. to 9,600 B.C. that we call the Younger Dryas, no beavers should have been around in the Transurals,” he said.)

Written with an eye toward disentangling Western science from colonialism, Dr. Terberger’s latest paper challenges the ethnocentric notion that pretty much everything, including symbolic expression and philosophical perceptions of the world, came to Europe by way of the sedentary farming communities in the Fertile Crescent 8,000 years ago.

“It’s similar to the ‘Neanderthals did not make art’ fable, which was entirely based on absence of evidence,

Likewise, the overwhelming scientific consensus used to hold that modern humans were superior in key ways, including their ability to innovate, communicate and adapt to different environments.

Nonsense, all of it.”

makes it clear that arguments about the wealth of mobiliary art in, say, the Upper Paleolithic of Germany or France by comparison to southern Europe, are largely nonsensical and an artifact of tundra (where there are no trees and you use ivory, which is archaeologically visible) versus open forest environments

The Shigir Idol, named for the bog near Kirovgrad in which it was found, is presumed to have rested on a rock base for perhaps two or three decades before toppling into a long-gone paleo-lake, where the peat’s antimicrobial properties protected it like a time capsule.

“It was not a scientific construction,”

“The rings tell us that trees were growing very slowly, as the temperature was still quite cold,”

Dr. Terberger respectfully disagrees.

“The landscape changed, and the art — figurative designs and naturalistic animals painted in caves and carved in rock — did, too, perhaps as a way to help people come to grips with the challenging environments they encountered.”

And what do the engravings mean? Svetlana Savchenko, the artifact’s curator and an author on the study, speculates that the eight faces may well contain encrypted information about ancestor spirits, the boundary between earth and sky, or a creation myth.

The temple’s stones were carved around 11,000 years ago, which makes them 1,500 years younger than the Shigir Idol.

One could wonder how many similar pieces have been lost over time due to poor preservation conditions.”

The similarity of the geometric motifs to others across Europe in that era, he added, “is evidence of long-distance contacts and a shared sign language over vast areas. The sheer size of the idol also seems to indicate it was meant as a marker in the landscape that was supposed to be seen by other hunter-gatherer groups — perhaps marking the border of a territory, a warning or welcoming sign.”

“What do you think is the hardest thing to find in the Stone Age archaeology of the Urals?”A pause: Sites?“No,” he said, sighing softly. “Funding.”

Scientists have spent hundreds of years trying to understand how human sensory organs work, concluding that sight is the most important sense, followed hearing, touch, taste and smell.

To answer this question, an international team led by Professor Majid, conducted a large-scale experiment to investigate the ease with which people could communicate about colors, shapes, sounds, textures, tastes and smells

Speakers of 20 diverse languages, including three different sign languages, from across the globe were tested, ranging from hunter-gatherers to post-industrial societies

If the commonly accepted hierarchy of the senses were true, participants in the study should have been able to communicate about vision most easily, followed by sounds, such as loud and quiet; textures, such as smooth and rough; taste, such as sweet and sour; and smell, such as chocolate and coffee

"While English speakers behaved as predicted, describing sight and sound with ease, this was not the case across all cultures

What this study shows us is that we can't always assume that understanding certain human functions within the context of the English language provides us with a universally relevant perspective or solution

In a modern digital-led world, which typically engages sight and hearing, it could be worthwhile learning from other cultures in the way that taste and smell can be communicated

This could be particularly important for the future of some professions, such as the food industry, for example, where being able to communicate about taste and smell is essential

Animal communication systems, in contrast, typically have at most a few dozen distinct calls, and they are used only to communicate immediate issues such as food, danger, threat, or reconciliation. Many of the sorts of meanings conveyed by chimpanzee communication have counterparts in human 'body language'.

The basic difficulty with studying the evolution of language is that the evidence is so sparse. Spoken languages don't leave fossils, and fossil skulls only tell us the overall shape and size of hominid brains, not what the brains could do

All present-day languages, including those of hunter-gatherer cultures, have lots of words, can be used to talk about anything under the sun, and can express negation. As far back as we have written records of human language - 5000 years or so - things look basically the same.

According to current thinking, the changes crucial for language were not just in the size of the brain, but in its character: the kinds of tasks it is suited to do - as it were, the 'software' it comes furnished with.

So the properties of human language are unique in the natural world.

About the only definitive evidence we have is the shape of the vocal tract (the mouth, tongue, and throat): Until anatomically modern humans, about 100,000 years ago, the shape of hominid vocal tracts didn't permit the modern range of speech sounds. But that doesn't mean that language necessarily began the

Some researchers even propose that language began as sign language, then (gradually or suddenly) switched to the vocal modality, leaving modern gesture as a residue.

. In an early stage, sounds would have been used to name a wide range of objects and actions in the environment, and individuals would be able to invent new vocabulary items to talk about new things

In order to achieve a large vocabulary, an important advance would have been the ability to 'digitize' signals into sequences of discrete speech sounds - consonants and vowels - rather than unstructured calls.

These two changes alone would yield a communication system of single signals - better than the chimpanzee system but far from modern language. A next plausible step would be the ability to string together several such 'words' to create a message built out of the meanings of its parts.

This has led some researchers to propose that the system of 'protolanguage' is still present in modern human brains, hidden under the modern system except when the latter is impaired or not yet developed.

Again, it's very hard to tell. We do know that something important happened in the human line between 100,000 and 50,000 years ago: This is when we start to find cultural artifacts such as art and ritual objects, evidence of what we would call civilization.

One tantalizing source of evidence has emerged recently. A mutation in a gene called FOXP2 has been shown to lead to deficits in language as well as in control of the face and mouth. This gene is a slightly altered version of a gene found in apes, and it seems to have achieved its present form between 200,000 and 100,000 years ago.

Nevertheless, if we are ever going to learn more about how the human language ability evolved, the most promising evidence will probably come from the human genome, which preserves so much of our species' history. The challenge for the future will be to decode it.

The genes of the oldest known residents of the Caribbean link them with the earliest populations that settled in Central and South America.

Part of the problem is that scientists have yet to find ancient DNA in the Caribbean that is more than 3,000 years old

The other problem is that ancient DNA is still scarce on the Caribbean coast of the mainland.

About 2,500 years ago, the archaeological record shows, there was a drastic shift in the cultural life of the Caribbean. People started living in bigger settlements, intensively farming crops like maize and sweet potatoes. Their pottery became more sophisticated and elaborate. For archaeologists, the change indicates the end of what they call the Archaic Age and the start of a Ceramic Age.

The skeletons from the Ceramic Age largely shared a new genetic signature. Their DNA links them to small tribes still living today in Colombia and Venezuela.

We don’t know a lot about these languages, although some words have managed to survive. Hurricane, for example, comes from hurakán, the Taino name for the god of storms.

The people bearing Ceramic Age ancestry came to dominate the Caribbean, with almost no interbreeding between the two groups.

These words bear a striking resemblance to words from a family of languages in South America called Arawak. The DNA of the Ceramic Age Caribbeans most closely resembles that of living Arawak speakers.

the new DNA findings had surprised him in many ways, giving him a host of new questions to investigate.

Over the course of the Ceramic Age, for example, strikingly new pottery styles emerged every few centuries. Researchers have long guessed that those shifts reflect the arrival of new groups of people in the islands. The ancient DNA doesn’t support that idea, though. There’s a genetic continuity through those drastic cultural changes. It appears that the same group of people in the Caribbean went through a series of major social changes that archaeologists have yet to explain.

Dr. Reich and his fellow geneticists also discovered family ties that spanned the Caribbean during the Ceramic Age. They found 19 pairs of people on different islands who shared identical segments of DNA — a sign that they were fairly close relatives. In one case, they found long-distance cousins from the Bahamas and Puerto Rico, separated by over 800 miles.

“The original idea was that people start in one place, they establish a colony someplace else, and then they just cut all ties to where they came from,” Dr. Keegan said. “But the genetic evidence is suggesting that these ties were maintained over a long period of time.”

Rather than being made up of isolated communities, in other words, the Caribbean was a busy, long-distance network that people regularly traveled by dugout canoe. “The water is like a highway,”

The genetic variations also allowed Dr. Reich and his colleague to estimate the size of the Caribbean society before European contact. Christopher Columbus’s brother Bartholomew sent letters back to Spain putting the figure in the millions

The DNA suggests that was an exaggeration: the genetic variations imply that the total population was as low as the tens of thousands.

now, with a population of about 44 million people, the Caribbean may contain more Taino DNA than it did in 1491.

Dr. Aviles and his colleagues have uploaded the ancient Caribbean genomes to a genealogical database called GEDMatch. With the help of genealogists, people can compare their own DNA to the ancient genomes. They can see the matching stretches of genetic material that reveal their relatedness.