Japan Sleeps Six Hours and Eighteen Minutes a Night. France Sleeps Nearly Eight. Both Are Fine.

Japan Sleeps Six Hours and Eighteen Minutes a Night. France Sleeps Nearly Eight. Both Are Fine.

In a 2025 study published in PNAS, researchers led by Christine Ou and Steven Heine asked roughly 250 people in each of 20 countries, spanning six continents, how long they’d slept the night before. France came out on top at 7 hours and 52 minutes. Japan came in last at 6 hours and 18 minutes. The gap between them, an hour and thirty-four minutes, is roughly the difference between a full sleep cycle. If sleep science worked the way most public health messaging implies it does, that gap should show up in the data as a gap in wellbeing. Japan should look, on paper, like a nation quietly grinding itself down. It doesn’t. Diabetes rates, heart disease, obesity, life expectancy: none of it tracks with how long a country sleeps. In a separate analysis of 353 national sleep averages pulled from 14 different datasets covering 71 countries, the team found no relationship between a country’s average sleep duration and its rates of heart disease, diabetes, or life expectancy. Stranger still, countries where people slept longer had higher obesity rates, the opposite of the pattern researchers have repeatedly found when they study individuals within a single country. This is the kind of result that should make you sit up. Not because it’s surprising in isolation. Findings about sleep and individuals are everywhere, and so are claims that whichever number a press release happens to favor is the one that will fix your life. What’s surprising is what happens when you zoom out from individuals to populations. The relationship between sleep and health doesn’t vanish at the national level. It gets reorganized. What the Curve Actually Looks Like Inside any given country, the study replicates the familiar shape: a curve, not a line. Sleep too little, your health composite score (built from depression, chronic conditions, subjective health, and overall wellbeing) drops. Sleep too much, it drops again. There’s a sweet spot in the middle, and it’s a real, statistically robust feature of the data within every single country in the sample. But the position of that sweet spot moves. The researchers found a turning point, the amount of sleep associated with peak health, for each of the 20 countries individually, and those turning points differed significantly from one another. The optimal number isn’t one number. It’s twenty numbers, one per culture, and they don’t converge. What did converge, across every country studied, was something else entirely: the gap between how much people actually slept and where their personal curve peaked. In every country, average sleep duration fell short of the turning point. Everyone, everywhere, is sleeping somewhat less than their own culture’s apparent optimum. The shortfall is universal. The optimum is not. There’s a second result buried in here that’s arguably more interesting than the headline finding, and it has nothing to do with hours. The researchers asked each participant not just how long they’d slept, but what they believed their cultureconsidered an ideal amount of sleep. Then they measured the gap between a person’s actual sleep and their own estimate of that cultural ideal. People whose sleep was closer to what they believed their culture expected, regardless of whether that was six hours or eight, reported better health. The effect held up even after controlling for the raw number of hours slept. In other words: it’s not just that six hours works for some places and eight works for others. It’s that matching the local norm, whatever that norm happens to be, carries its own independent health signal. The researchers floated a few explanations. Maybe people feel subjectively healthier when their habits feel normal. Maybe there’s friction, low-grade and cumulative, in being out of step with everyone around you (worrying about missing the early train, structuring your evening around a schedule nobody else keeps). Maybe it’s something more biological: people whose sleep architecture doesn’t fit their environment may be, for reasons unrelated to the hours themselves, less healthy to begin with, and the correlation runs the other direction. The data can’t distinguish between these, and the authors are upfront that it’s correlational throughout. But the fact that “fit” predicts health independently of “amount” is the kind of finding that quietly reframes the whole question. The View From Three Million Years Back None of this happens in a vacuum, obviously, and one of the more useful frames for thinking about why a six-hour average and an eight-hour average can both sit at the top of their respective curves comes from outside the PNAS paper entirely. David Samson, an evolutionary anthropologist at the University of Toronto, has spent years studying sleep across the primate order, lemurs, orangutans, chimpanzees, and eventually humans themselves, including extended fieldwork living alongside the Hadza in Tanzania and the BaYaka in the Republic of the Congo. His phylogenetic models, built from sleep data across more than 30 primate species and controlling for body size, brain size, social structure, and terrestriality, generate a prediction for how much Homo sapiens “should” sleep given our biology: about 11.5 hours per 24-hour period. We sleep, on average, about seven. That’s not a small discrepancy. Owl monkeys sleep up to 17 hours. Tarsiers manage 15. Lemurs sit around 13 to 14. Great apes, our closest relatives, average somewhere between 9.5 and 10. Humans are the outlier of the entire order, the primates who sleep the least, by a wide margin, relative to what their biology would predict. Samson’s argument, laid out in his book The Sleepless Ape [https://amzn.to/4eKMywo], is that this isn’t a deficit. It’s the result of a real evolutionary shift, one he dates to roughly 1.8 million years ago, when Homo erectus began building shelters. Once you have a controlled sleeping environment, natural selection has room to start trimming non-REM sleep, gradually, over hundreds of thousands of years. At the same time, the advent of cooking with fire collapsed the daily chewing budget. Chimpanzees spend five to six hours a day chewing raw food. Gorillas spend up to eleven. Cooked food cut that down to roughly an hour for humans. Between the sleep reduction and the chewing reduction, Samson estimates our ancestors freed up something on the order of four extra hours a day, time that could go toward toolmaking, social bonding, teaching, and the kind of cumulative culture that no other primate manages at scale. The “human sleep paradox” is that we’re the short-sleeping primate who also lives the longest and thinks the hardest. Samson’s framing is that the short sleep isn’t despite our cognitive advantages. It’s bound up with how we got them. Where the Stories Meet, and Where They Don’t Here’s where it gets genuinely interesting, because the two pictures, the PNAS cross-cultural data and Samson’s evolutionary one, line up in one place and pull apart in another. They agree on the headline: humans sleep less than the textbooks have generally assumed they should, and it’s not a crisis. The widespread narrative of a modern “sleep deprivation epidemic,” driven by phones and stress and artificial light, gets undercut from two completely independent directions. The PNAS data shows no health penalty for nations that sleep less. And Samson’s fieldwork found something that should be more alarming to that narrative than it usually gets credit for: small-scale societies like the Hadza and the BaYaka sleep less than industrialized populations, not more, averaging around 6.4 hours, with sleep efficiency around 70%, well below the 85% the National Sleep Foundation considers high quality. If anyone should be sleeping “naturally,” free of screens and shift work and 11pm emails, it’s hunter-gatherers. And they’re sleeping worse, by the conventional metrics, than people in Tokyo or Toronto. So why aren’t they falling apart? Samson’s answer points toward circadian alignment rather than duration: groups like the Himba, who he describes as averaging around four and a half hours of sleep a night, show solid cardiovascular and mental health markers, which he attributes to their internal biological clocks being tightly synchronized with their actual environment, light, temperature, activity, in a way that industrialized sleepers, insulated by climate control and artificial lighting, generally are not. This is where the PNAS finding about “cultural fit” starts to look less like a soft psychological add-on and more like it might be pointing at the same underlying mechanism from a completely different angle. The PNAS researchers measured fit to a perceived social norm, what your culture expects. Samson’s framework is about fit to a physical environment, what your biology expects. These aren’t the same thing, and the paper doesn’t make this connection, doesn’t even gesture at Samson’s work at all. But it’s hard not to wonder whether “matching your culture’s sleep norm” and “matching your environment’s light and temperature cycle” are, in many traditional societies, simply the same variable measured twice. The social schedule and the solar schedule used to be the same schedule. In a lot of the modern world, they’ve come apart, and you’re free to match one without the other. Where the two pictures genuinely diverge is on what counts as the unit of explanation. Samson’s framework is a species-level story: humans, as a species, evolved to need less sleep than the primate baseline would predict, full stop, and the explanation is fire and shelter and a few hundred thousand years of selection pressure. The PNAS data doesn’t dispute that humans sleep less than other primates, nobody’s claiming we should be at 11 hours, but it insists that even within the human range, “how much” isn’t settled by species-level biology alone. The turning points for the health curve differ by a measurable, statistically significant amount across 20 countries that share the same evolutionary history. Whatever Samson’s 1.8-million-year story explains, it doesn’t explain why Japan’s optimum and France’s optimum land somewhere different. That gap is being filled by something that operates on a much faster timescale than natural selection, something closer to culture, climate, light exposure, work schedules, the things that differ between Tokyo and Paris but not between Homo sapiens in Tokyo and Homo sapiens anywhere else. Latitude turns out to be one of the few variables that predicts sleep duration with any consistency across both studies, longer sleep further from the equator, which the PNAS authors note replicates earlier work. But latitude alone doesn’t explain the turning points, and it doesn’t explain why “fit to your culture’s expectation” carries an independent health signal on top of the raw hours. There’s a gap here, between what the species-level evolutionary story explains and what the population-level cultural story describes, and as far as either piece of work goes, nobody’s filled it yet. What both perspectives share, in the end, is a quiet correction to a piece of received wisdom: that there’s a number, and the number is the same for everyone, and falling short of it is a failure of modern life. The PNAS data says the number depends on where you live and what your neighbors expect. Samson’s evolutionary framing says the number depends on what your species did with the time it freed up by needing less of it in the first place. Neither one says seven hours is wrong. They just disagree, interestingly, about what “right” would even mean. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.anthropology.net/subscribe [https://www.anthropology.net/subscribe?utm_medium=podcast&utm_campaign=CTA_2]

Bone Tools and Borrowed Bodies: The Strange Burial at Loch Borralie

Sometime in the decades bracketing the turn of the millennium — after Julius Caesar’s expeditions to Britain but before the Roman legions reached Scotland — a woman’s body was taken apart. Her brain was removed. The base of her skull shows a fracture pattern inconsistent with any known accident: not a fall, not a collapse, not a drop from a height. The break radiates across the right occipital bone in a way the researchers who reanalyzed her remains describe as most consistent with an intentional targeted impact. Whether that blow came at or just before death is unclear. What happened next is somewhat easier to read. The interior surface of her frontal bone carries straight, parallel striations — fine incisions running across the inside of her skull, made with a sharp implement while the bone was fresh. Brain removal, probably shortly after death. Then her long bones were worked. Both humeri, the left ulna, the left femur: all present in the grave as fragments, roughly half their original length. They weren’t gnawed. The cut surfaces don’t match rodent activity. Instead, the cortical bone has been stripped back and the exposed inner material whittled to a sharp, pointed end. One femoral fragment shows something more: a flat, smoothed margin at the tip, as if the point had been pressed and worn against another surface. Use-wear, on a human thighbone. After all of this, every modified bone was laid back into anatomically correct position within a low stone cairn on the Durness Peninsula, at the far north-western edge of the Scottish mainland. Reassembled. Deliberate. The site is called Loch Borralie. The woman — Individual 1 in the published analysis by Laura Castells Navarro and colleagues at the University of York, published in Antiquity — was probably over thirty years old at death, most likely female based on ancient DNA. Beside her, slightly later in the stratigraphy, lay a juvenile of about fifteen. These are the only two bodies found in the cairn. A body between worlds One of the persistent puzzles of Iron Age Britain is that most people, archaeologically speaking, simply disappear. Formal cemeteries with tidy inhumations are rare; the period runs roughly from 800 BC to the Roman conquest in AD 43, and across most of that span and most of that geography, archaeologists struggle to find the dead at all. The favoured interpretation is that excarnation or exposure was common — bodies left to decompose, scatter, return to the landscape — leaving little trace. What survives tends to be stranger. Human remains turn up under house floors, in grain storage pits, at settlement boundaries. Not buried so much as incorporated. The dead, in this reading, remained active within the world of the living: their bones kept, circulated, modified, deployed. North-west Scotland and the Northern and Western Isles preserve the clearest evidence for this, partly because the environmental conditions are good for bone survival. Mummification has been identified at Cladh Hallan on South Uist. Modified bones — perforated skull fragments, bones worked into objects — appear across Atlantic Scotland with enough regularity that they constitute a pattern. Individual 1 at Loch Borralie fits somewhere in this tradition, though her treatment goes beyond most parallels. The closest single analog for her modified long bones comes from Wag of Forse in Caithness, where a human femur worked to a point — showing extensive wear, polish, and red staining — had been placed under the entrance of an Iron Age roundhouse. Another worked femoral fragment, polished through use, came from a ditch at Fairfield Park in Bedfordshire. The Loch Borralie bones predate the Caithness example by several centuries, but the practice appears consistent enough to suggest a tradition rather than an anomaly. What the bones were used for is genuinely unknown. The team is careful not to overclaim. Brain removal could reflect cannibalism, but there’s no evidence of the long-bone processing for marrow extraction that typically accompanies it. It could reflect a practice of cleaning and preserving the skull for curation or display — something attested elsewhere in Iron Age contexts. The worked long bones may have functioned as implements of some kind; the femoral wear suggests actual use, but the other three modified bones show no comparable signs. And then, after whatever period of use or curation, the whole assemblage was laid out correctly, bones in their right places, and covered by stone. The team’s interpretation, offered cautiously, is that this woman’s remains were held and processed for an interval before final deposition. The care of the reassembly, the anatomical precision of the arrangement, suggests reverence rather than disposal. The degree of handling implies sustained engagement, not a single perimortem event. The juvenile beside her — Individual 2, male, around fifteen — shows none of this complexity. His skeleton is poorly preserved, only about a quarter surviving, and his skull had eroded out of the cairn entirely by the time excavators arrived in 2000. His bones carry signs of developmental disruption: enamel hypoplasia indicating periods of malnutrition in childhood, possible vitamin C deficiency, two fused cervical vertebrae likely congenital. He was not treated after death the way the woman was. His burial is, by comparison, ordinary. Where they came from, and who they were The two individuals are related. Their mitochondrial haplogroup — T2b30 — is otherwise unattested in any published ancient individual from Britain. Sharing it almost certainly means shared maternal ancestry. The team’s identity-by-descent analysis, which detects shared DNA fragments too small for standard relatedness algorithms to reliably identify, found four shared segments totaling over 43 centimorgans. The longest runs to about 12 cM, consistent with a fifth-degree or more distant relationship. Given their approximate ages at death, their matching radiocarbon dates placing both deaths between roughly 50 BC and AD 70, and that rare mitochondrial signature, the most probable relationship is second cousins through a shared pair of great-grandparents. That’s a meaningful connection, but it’s not a parent-child pair, not siblings. They were kin in the way that members of a dispersed extended family are kin — connected, probably known to each other, but not necessarily cohabiting. Neither of them grew up at Loch Borralie. The isotope signatures preserved in their tooth enamel — strontium, oxygen, sulphur — point consistently toward a coastal upbringing: high strontium concentrations comparable to Iron Age communities on Orkney and the Western Isles, sulphur values typical of coastal populations. The oxygen values narrow this further, excluding western Britain and northern Scotland, pointing instead to a stretch of the east Sutherland coast between roughly modern Helmsdale and Golspie, around 80 kilometers southeast of where they were buried. Individual 1’s enamel reflects her diet and environment between roughly 7.5 and 17.5 years of age; Individual 2’s goes back to toddlerhood. Both signals point the same direction. The journey from that east coast to Loch Borralie is not trivial. Overland, across the Highlands, it takes several days on foot. By sea, it means navigating the Pentland Firth, one of the most challenging stretches of water in Britain. They likely traveled together, possibly as part of a larger group. They died within decades of each other. And they were buried in the same cairn, though probably not at the same time — the juvenile’s grave cut sits stratigraphically above the woman’s initial deposit. The genetic picture extends considerably further than the two of them. Identity-by-descent analysis revealed that both individuals share DNA fragments with people buried in Orkney. Individual 1 is genetically related — distantly, perhaps eighth degree or beyond — to a man buried at the Atlantic roundhouse site of Bu, dated to between roughly 400 and 200 BC. That’s at least 150 years before the Loch Borralie woman’s death: possibly a direct ancestor, or the collateral relative of one. Individual 2 connects to a person from Knowe of Skea in Orkney, dated slightly later, broadly contemporary with the Loch Borralie burials. Both Orcadian individuals, in turn, share distant genetic ties with a man buried in a rubble cairn on a storm beach at Applecross, on the west coast of Scotland, roughly 140 kilometers southwest of Loch Borralie. That site contained the remains of at least six adult males, deposited periodically from the second century BC to the third century AD. The Applecross man is roughly contemporary with the Loch Borralie individuals. The network this traces runs approximately 265 kilometers, from Applecross in the south to Knowe of Skea in the north, with the Loch Borralie individuals positioned at a kind of geographic midpoint. The people connected by this web almost certainly did not know each other. Many of these biological links bridge generations, even centuries. But as the researchers point out, distant IBD relationships are less a window into personal kinship than a proxy for the movement of people across landscapes and seaways over time. The genetic signal persists long after direct knowledge of family connections would have faded. What makes this coherent is the shared maritime geography. All of these sites sit on or near the sea. The broch towers that characterize the Iron Age archaeology of Atlantic Scotland — those distinctive drystone roundhouses rising sometimes to ten meters or more — show strikingly similar construction techniques and architectural forms from Shetland to the Western Isles. Shared material culture across a wide coastal arc has always implied connection; the genetic and isotopic data now supply some of its human content. People moved between these communities, carrying whatever they carried — biological ancestry, cultural practices, possibly the bodies of their dead. The team suggests that the pattern of burial itself — individuals deposited in accumulating rubble cairns or within the ruins of earlier buildings, periodically, over generations — may represent a coherent funerary tradition that has previously gone unrecognized simply because its archaeological footprint is so modest. The cairn at Loch Borralie, the Applecross storm beach, the roundhouse rubble at Bu and Howe of Howe and Knowe of Skea: structurally similar, genetically linked, spread across the northern Scottish seaboard. Not random. A practice with a geography. The woman at the center of it — reassembled, carefully arranged, her worked bones returned to their anatomical places — remains the hardest part to interpret. Whatever was done to her and with her before that final deposition, the ending looks like care. The people who placed her there knew where every bone belonged. Further Reading * Shapland, F. & Armit, I. 2012. The useful dead: bodies as objects in Iron Age and Norse Atlantic Scotland. European Journal of Archaeology 15: 98–116. https://doi.org/10.1179/1461957112Y.0000000004 * Parker Pearson, M. et al. 2021. Cladh Hallan: roundhouses and the dead in the Hebridean Bronze Age and Iron Age, part 1: stratigraphy, spatial organisation and chronology. Oxford: Oxbow. * Evans, J.A. et al. 2012. A summary of strontium and oxygen isotope variation in archaeological human tooth enamel excavated from Britain. Journal of Analytical Atomic Spectrometry 27: 754–64. https://doi.org/10.1039/C2JA10362A * Armit, I. & Büster, L. 2020. Darkness visible: the Sculptor’s Cave, Covesea, from the Bronze Age to the Picts. Edinburgh: Society of Antiquaries of Scotland. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.anthropology.net/subscribe [https://www.anthropology.net/subscribe?utm_medium=podcast&utm_campaign=CTA_2]

When the Guardians Become the Threat: Tanzania’s Heritage Crisis

Kilwa Kisiwani is an island off Tanzania’s southern coast where a medieval port civilization once traded gold, cloth, and Chinese porcelain across the Indian Ocean. Between the twelfth and thirteenth centuries, it was one of the most significant commercial nodes in the world. The tenth-century Arab geographer Al-Masudi documented it. The sixteenth-century Kilwa Chronicle preserved the genealogies of its sultans. Today, visitors arriving at the UNESCO World Heritage Site encounter something else: a large corrugated-iron-roofed building, 25 by 20 meters, standing at the entrance with six oversized glass windows starkly out of scale with the surrounding medieval ruins. Behind the small domed mosque, a toilet block sits where one should never be placed, violating basic norms of Islamic spatial separation between sacred and polluting structures. The stone used to build it, according to a laborer who worked on the project, came from an underground archaeological foundation unearthed during excavation. No cultural heritage impact assessment was conducted before any of it was built. Ceramics, beads, and coins disturbed during construction were scooped into buckets and piled in a corner. According to one resident who worked on the project, a site manager who was himself an antiquities official directed workers to collect the materials and pile them for “further analysis.” The piles were eventually moved to an antiquities office. Whether they were ever analyzed is not recorded. This is the picture that emerges from a new study published in Antiquity by archaeologists Elgidius B. Ichumbaki of the University of Dar es Salaam and Peter R. Schmidt of the University of Florida. Working across four sites — Kilwa Kisiwani, the Laetoli footprint site, the Kondoa rock art complex, and the Kaiija Early Iron Age shrine in Katuruka — they document a pattern of institutional failure so consistent and so severe that it amounts to a systemic crisis. The threat to Tanzania’s heritage, they argue, is not primarily climate change or looting or war. It is the government itself. A Reorganization Without Expertise The story of how this happened begins in 2018. Tanzania’s Department of Antiquities (DoA) had spent years failing to turn cultural heritage sites into the tourism engines the government imagined they could be. Natural parks were generating substantial income; why not ancient ruins and hominin trackways? The DoA could not build the infrastructure or demonstrate economic potential, so the Ministry of Natural Resources and Tourism reassigned management of dozens of sites to agencies that had no relevant expertise whatsoever. The Tanzania Wildlife Authority (TAWA) took over Kilwa Kisiwani. The Tanzania Forest Services Agency (TFS) was handed the Kondoa rock art sites. The Ngorongoro Conservation Area Authority (NCAA) received Laetoli. The changes were formalized in Government Notice Number 632 of August 2020. The criteria used to decide which agency got which site were never disclosed. TAWA manages wildlife. TFS manages forests. NCAA manages a conservation area. None of them employ cultural heritage specialists, none have budget lines to hire any, and none can be expected to understand the difference between developing a safari lodge and developing infrastructure within a stratified archaeological deposit. The DoA’s own mandate was preservation and management of antiquities; it had trained personnel, institutional memory, and legal authority. What it apparently lacked was the will to act. The reorganization was, as Ichumbaki and Schmidt read it, not genuine decentralization in any meaningful sense. It was a lateral transfer within the same ministry, a bureaucratic escape from accountability dressed up as reform. TAWA’s performance at Kilwa Kisiwani illustrates the consequences precisely. The paved footpath running 600 meters through the site required excavating into undisturbed middens to lay concrete borders. An interpretation center was built 100 meters north of the fourteenth-century palace of Husuni Kubwa without any assessment of what lay underground. Every structure was constructed without the heritage impact studies that Tanzanian law and UNESCO protocols both require. Footprints in Concrete Laetoli complicates the picture slightly, because the incompetence there predates the 2018 reorganization and traces back to a presidential visit. In 2008, President Jakaya Kikwete traveled more than 200 kilometers to see the Laetoli hominin footprints — tracks pressed into volcanic sediment by Australopithecus afarensis individuals 3.66 million years ago, the oldest evidence of hominin bipedality on record. He was shown only a two-meter section of the trackway, with protective stones piled on top of the rest. Reportedly displeased, he directed that the tracks be uncovered and a proper museum built over them. That directive set a project in motion. Unusually, a cultural heritage impact assessment was conducted before construction began, and it led to a remarkable discovery: in 2014 and 2015, a University of Dar es Salaam team working at Site S found a second trackway representing two individuals, later designated S1 and S2, moving in the same direction as the known tracks at Site G. Analysis of the new footprints added significantly to what we know about body size variation within Australopithecus afarensis. The project was paused. Then, in 2023, it resumed. Without expert consultation. The NCAA constructed a 47-by-12-meter rectangular building over Site G, with an interior foundation of 40 by 8 meters supporting a viewing platform roughly two meters high. A smaller structure at Site S was built directly over part of the trackway, including four footprints identified by local Maasai communities as belonging to Lakalanga, a figure of cultural importance to them. Between the two sites, a walkway of large pavers mimicking hominin footprints was laid after land leveling — an operation involving heavy earth-moving equipment crossing terrain that still contains documented animal tracks and hominin footprints. Ichumbaki and Schmidt’s site observations recorded a heavy excavator moving through that landscape during construction. The NCAA’s characterization of these permanent structures as “semi-permanent” does not change what they are or what was destroyed to build them. Cages, Concrete, and Communities Left Out The Kondoa rock art sites in central Tanzania offer a different set of problems, though the underlying institutional failure is the same. Between 150 and 450 paintings decorate rock shelters, caves, and overhanging cliffs across the landscape. They are not merely ancient marks on stone; local communities continue to use these sites for rainmaking, healing, initiation, and divination. The living relationship between the paintings and the people who made them is, in heritage terms, part of the significance. In 2016, the DoA and TFS responded to concerns about dust and water damage at the Kolo B1-B3 sites by pouring concrete floors across the shelter interiors. Ichumbaki and Schmidt consider this a straightforward act of site destruction. TFS also replaced a footpath to one hilltop painting site with a 900-meter gravel road, wide enough for vehicles, constructed without any heritage impact assessment and without monitoring. On-site observations from January 2020 documented disturbed lithic artefacts along its edges. Earlier, the government had tried to protect the paintings from ritual activity by erecting cages around the art-bearing rock faces. Local communities dismantled them and repurposed the materials. Ichumbaki and Schmidt cite this as a lesson worth taking seriously: protective enclosures imposed without community buy-in tend to fail, and the appropriate response is collaborative stewardship, not enforcement. The government learned the opposite lesson. The fourth case study, from Katuruka in northwestern Tanzania’s Kagera region, makes that failure most explicit. The Kaiija shrine is the site of an Early Iron Age forge dating to the late first millennium BC, one of the oldest iron-working sites in East Africa, embedded within the seventeenth-century capital of King Rugomora Mahe. For the Haya people, Kaiija — meaning “place of the forge” — represents the deep-time origin of an economy built on iron production and, through it, agricultural prosperity. Schmidt’s collaborative research with Haya elders beginning in the late 1960s documented the oral traditions tied to the site and excavated the forge itself. After the Kaiija Tree, a monumental living part of the shrine, was killed in the mid-1990s by a neighboring landowner who complained it shaded his banana farm, the community mobilized. Katuruka villagers formed a representative committee and an NGO, reconstructed a royal spirit house, and built interpretive infrastructure to memorialize the site. The project worked. The community was doing precisely what Tanzania’s 2008 Cultural Heritage Policy nominally encouraged. Then a collateral branch of the royal clan, which had no traditional ties to Kaiija, filed land claims against the NGO. Lawsuits and intimidation dragged on for four years. One of the plaintiffs built a competing “royal house” nearby and physically destroyed the reconstructed Buchwankwanzi ritual house, the site’s royal divination structure. The community appealed to regional authorities and to the Ministry responsible for Antiquities. Letters went unanswered. Two DoA staff members eventually visited, conducted interviews primarily with one plaintiff, and took no legal action. The Assistant Director of Antiquities later relayed, in a telephone call, unsubstantiated allegations against Schmidt himself — claims that he had removed a “pot of rupees” during the 1970 excavations and that he was conducting research without a permit. The message was clear enough: the DoA would not protect Kaiija, and it would prefer this go away. The case is still unresolved. Both the High Court and the District Housing and Land Tribunal have declined jurisdiction. The residents of Katuruka continue to wait. What the State Owes the Past Ichumbaki and Schmidt are careful to situate Tanzania’s situation within a broader global pattern. Similar dynamics play out in China, where profit-driven local authorities frequently destroy historic fabric and ignore communities in the name of heritage tourism development. The contradiction at the heart of Tanzania’s approach is stark: genuine decentralization, in any meaningful sense, would require empowering local communities and independent experts. Instead, the DoA transferred authority to other central government agencies while simultaneously undermining the community-based initiatives that were actually working. The result is neither centralized competence nor genuine local management. It is a vacuum. The researchers make a specific and actionable recommendation: Tanzania should fill the Advisory Council for Antiquities, a body established under the Antiquities Act in 1979 and mandated under Article 20 to include qualified, non-political representatives. That council has never been constituted. If it were, and if it were empowered to conduct a comprehensive review of heritage governance, there might be a path forward. That is a more modest demand than the situation would seem to warrant. At Kilwa Kisiwani, medieval ceramics sit in an antiquities office, stripped of their provenance. At Laetoli, buildings now stand on trackways that preserved 3.66-million-year-old steps. At Kondoa, concrete covers the floors of painted rock shelters. At Katuruka, the Buchwankwanzi house is a pile of collapsed thatch and timber. In each case, the institution nominally responsible for protecting the site was directly or indirectly responsible for the damage. That is the finding. What Tanzania and the international community do with it remains to be seen. Further Reading * Masao, F.T. et al. 2016. New footprints from Laetoli (Tanzania) provide evidence for marked body size variation in early hominins. eLife 5. https://doi.org/10.7554/eLife.19568 * Leakey, M.D. & Hay, R.L. 1979. Pliocene footprints in the Laetoli beds at Laetoli, northern Tanzania. Nature 278: 317–23. https://doi.org/10.1038/278317a0 * Schmidt, P.R. & Ichumbaki, E.B. 2020. Is there hope for heritage in former British colonies in Eastern Africa? A view from Tanzania. Journal of African Cultural Heritage Studies 3(1): 26–51. https://doi.org/10.22599/jachs.69 * Ichumbaki, E.B. & Munisi, N.C. 2024. Kilwa and its environs, in T. Spear (ed.) Oxford Research Encyclopedia of African History. New York: Oxford Academic. https://doi.org/10.1093/acrefore/9780190277734.013.1008 * Bwasiri, E.J. & Smith, B.W. 2015. The rock art of Kondoa District, Tanzania. Azania: Archaeological Research in Africa 50(4): 437–59. https://doi.org/10.1080/0067270X.2015.1120436 This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.anthropology.net/subscribe [https://www.anthropology.net/subscribe?utm_medium=podcast&utm_campaign=CTA_2]

A Poison on the Blade: Aconitine Traces and the Evidence for Surgical Anesthesia in Ming China

The scissors are 123mm long. So are the tweezers. Both are iron, nearly pure iron, the kind that only a mature smelting industry can reliably produce. They were buried sometime around the early fifteenth century with a man named Xia Quan, who died in 1411, in Jiangyin County in what is now Jiangsu Province, China. When archaeologists excavated the tomb in 1974, the instruments went to the Jiangyin Museum. Decades passed. Then someone looked more carefully at the rust. It wasn’t ordinary rust — or rather, it wasn’t only ordinary rust. In the places hardest to clean, the overlapping joints of the scissor blades, the recessed body of the tweezers near the handle, there were small deposits of bright red micro-residue. A team led by researchers from Northwest University in Xi’an collected just two milligrams from each instrument, a barely visible trace of red in a collection tube, and subjected them to a suite of analytical techniques. Their findings, published in Antiquity in 2026, suggest those red specks are the physical remnants of an anaesthetic applied during surgery more than six centuries ago. The substance in question is aconitine. It comes from plants of the Aconitum genus, a group that includes Aconitum carmichaelii and Aconitum kusnezoffii, both widely cultivated and collected across China. The alkaloid is extremely toxic. It is also, at controlled doses and in prepared form, a potent analgesic. Reading the residue Identifying organic compounds on corroded medieval iron is not straightforward. Conventional residue analysis techniques, including gas chromatography mass spectrometry, typically require larger samples and frequently fail when material is poorly preserved or quantities are minute. Early excavations in China compounded the problem by paying little attention to residue analysis at all, meaning that potential chemical evidence was often lost. The team addressed this by applying stimulated Raman scattering microscopy, an advanced optical technique that integrates spectroscopy and chemical imaging, and crucially, avoids the fluorescence interference that disrupts conventional Raman analysis. SRS works by detecting molecular vibrations at specific wavenumber ranges without needing to destroy the sample or extract more material than a microscope can accommodate. What they found in the residue particles was a characteristic cyano group (-CN) peak at around 2101–2105 cm⁻¹, alongside methylene (-CH₂-) stretching vibrations near 2848 cm⁻¹. The cyano absorption band is the telling signal: blood lacks cyano-compounds, so an organic residue containing a -CN group points away from biological contamination and toward a medicinal source. To confirm the identification, the team ran SRS analysis on a commercially prepared thin-tissue section of Aconitum carmichaelii as a reference. The reference spectrum showed a clear peak at 2103 cm⁻¹ in the cyano-stretching region, matching the residue exactly, and characteristic peaks at 2834, 2864, and 2882 cm⁻¹ in the C-H stretching region, closely mirroring the residue signals from both instruments. The ester group characteristic of intact aconitine (which would show up around 1700–1740 cm⁻¹) is absent from the spectra, which the team attributes to partial hydrolysis over six centuries. But the core chemical fingerprint, the cyano group and the methylene pattern, remained intact and detectable. The residues were also concentrated in the functional parts of the instruments, consistent with deposition during use rather than later contamination. The plant, the poison, and how to work around it Aconitum has a long history in Chinese medicine. The character for aconite appears in oracle bone script from around 1250–1046 BCE, making it one of the earliest documented plant drugs in the archaeological record. Shen Nong’s Materia Medica, compiled during the Han dynasty, records it formally. By the Song Dynasty, practitioners had begun distinguishing between the cultivated form (A. carmichaelii) and the wild form (A. kusnezoffii), noting that the latter was the more toxic of the two. Toxicity was understood explicitly, not as a side effect in the modern pharmacological sense, but as an inherent property of the plant that had to be actively managed. By the Ming period, a body of processing knowledge had developed around making Aconitum preparations safe enough to administer. Methods included boiling in vinegar, soaking in black soybean decoctions, treating with boys’ urine, detoxifying with mung beans, and removing the outer skin of the tuber. These preparations produced what texts refer to as Caowu San (草乌散), anaesthetic powder, documented in at least four Ming medical compilations including Shiyi’s Formulary of Tested Efficacy and the Compendium of Medicine. The primary function was to render patients insensitive to pain during surgery. Nineteen historical Chinese anaesthetic formulae survive in textual records. Most include A. carmichaelii or A. kusnezoffii or both, often in combination with other plants including Datura, Ligusticum chuanxiong, and Pinellia ternata. Wang Kentang’s Standards for Diagnosis and Treatment: Ulcer Treatment (1602) describes direct clinical procedure: before using scissors in surgery, one would first apply a numbing agent to the area, then cut. In dental procedures recorded in Miscellaneous Sayings from the Upper Pool, tweezers were used after applying a small amount of glutinous rice paste. The instruments, in other words, routinely came into direct or indirect contact with medicinal preparations. The concentration of residue on the Xia Quan tweezers, near the handle, covering an area of about 1.5mm, is consistent with a medicinal liquid having splashed onto this concealed area during topical application and escaped cleaning. This is exactly what Ming surgical texts prescribe: applying the numbing compound to the patient’s skin before cutting. The residue is not on the working tips of the instruments but in the recessed areas near the handles, where a liquid applied from a container during use would naturally accumulate and persist. What makes this find distinctive is precisely that gap between textual and physical evidence. Ming medical texts have long described anaesthetic preparations and their use in surgery. But describing a practice and demonstrating it materially are different things. The Xia Quan instruments now provide the latter: direct chemical evidence, on actual surgical tools from a datable tomb, for the presence of Aconitum alkaloids. Whether this constitutes incontrovertible proof is worth being clear about. The SRS identification rests on spectral pattern-matching rather than full molecular characterisation, and the constraints imposed by the Jiangyin Museum on destructive sampling meant the analytical scope was limited. The authors are appropriately measured in framing the result as “probable” traces of aconitine. But the convergence of chemical signature, instrument type, residue location, and textual record makes the interpretation coherent and well-supported. The instruments themselves are telling too. At around 97% iron each, both tools reflect what was achievable through Ming smelting technology at its height. Jiangsu Province was a thriving centre for medical practice during the Ming and Qing dynasties, and the iron industry of the period, transitioning from state-run to private operations through the early 1400s, was producing tools of sufficient purity and precision for surgical use. The scissors closely resemble what modern practitioners would recognise as straight operating scissors. The tweezers, with their inward-curved tips, bear a functional resemblance to Allis tissue forceps. These are not rough approximations. They are purpose-built instruments. That a physician practising surgery in fourteenth-century Jiangyin would apply a processed Aconitum preparation to a patient’s skin, pick up iron scissors and tweezers, and cut — and that those instruments would eventually carry molecular traces of the preparation into a tomb, through six hundred years of corrosion and storage, and into a spectrometer — is, to put it plainly, remarkable. Not because it requires us to revise what we knew about Ming medicine. The textual record already pointed here. But because the chemistry now agrees. Further Reading * Cheng, J.X. & Xie, X.S. (2015). Vibrational spectroscopic imaging of living systems: an emerging platform for biology and medicine. Science 350. https://doi.org/10.1126/science.aaa8870 * Rageot, M. et al. (2023). Biomolecular analyses enable new insights into ancient Egyptian embalming. Nature 614: 287–93. https://doi.org/10.1038/s41586-022-05663-4 * Giachi, G. et al. (2013). Ingredients of a 2,000-y-old medicine revealed by chemical, mineralogical, and botanical investigations. Proceedings of the National Academy of Sciences USA 110: 1193–96. https://doi.org/10.1073/pnas.1216776110 * Czamara, K. et al. (2014). Raman spectroscopy of lipids: a review. Journal of Raman Spectroscopy 46: 4–20. https://doi.org/10.1002/jrs.4607 * Müller, B. et al. (1992). Raman studies of solid hydrogen cyanide (HCN, DCN) and of HCN argon matrices. Spectrochimica Acta Part A: Molecular Spectroscopy 49: 191–97. https://doi.org/10.1016/0584-8539(93)80174-9 This is a public episode. 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Pigeon Domestication Is Nearly a Thousand Years Older Than We Thought

Somewhere beneath the floors of a Bronze Age harbor city on Cyprus, excavators found the bones of pigeons. Not one or two. Dozens. Many were burned, consistent with cooking or deliberate disposal after a meal. Some belonged to juveniles that had never left the nest. And when researchers analyzed the chemical signatures locked in 37 of those bones, they found something that required some explaining: the pigeons had been eating almost exactly the same food as the people. That is the central finding of a study published in Antiquity by Anderson L. Carter, Canan Çakırlar, and colleagues at the University of Groningen and collaborating institutions. The site is Hala Sultan Tekke, on the southeastern coast of Cyprus, occupied during the Late Bronze Age from roughly 1650 to 1150 BCE. The birds are Columba livia — the rock dove, ancestor of every pigeon currently working a city sidewalk. The isotope signature matters because it is hard to explain away. Stable carbon and nitrogen values in bone collagen reflect what an animal ate over its lifetime. Wild birds forage opportunistically; their isotope values scatter widely. The pigeons at Hala Sultan Tekke did not scatter. Their dietary range was tighter than that of any other species in the regional comparison dataset — tighter even than cattle, which were actively herded and managed. Using a statistical measure of dietary breadth called the corrected standard ellipse area, the team found that pigeons had the most constrained niche of all taxa sampled: a value of 1.26, compared with 1.75 for humans and 1.80 for cattle. In ecological terms, these were animals occupying a narrow, managed dietary slot. The nitrogen values told a more specific story. The mean nitrogen isotope value for the main pigeon grouping sat at around 8.82 per mille, placing these birds above known scavenging populations like dogs (8 per mille) and foxes (8.26 per mille) and overlapping almost exactly with the human samples drawn from comparable Cypriot Bronze Age sites (9.92 per mille). Whatever these birds were consuming, it was consistent, protein-enriched relative to a purely wild diet, and closely tied to what humans were eating. The team’s interpretation is that the pigeons were living inside the city and eating its waste — grain spillage, scraps, and possibly deliberate supplemental feed from people who were managing them. “Either way,” writes senior author Çakırlar, “this very likely means that they were domesticated or on their way to being domesticated.” The presence of juvenile bones at multiple contexts across the site reinforces this picture. Fledgling Columba liviabones in an urban deposit are not what you get from wild birds passing through. They confirm that the pigeons were breeding within the settlement itself. What Domestication Actually Means Here The word “domesticated” is doing real work in this study, and the authors handle it with appropriate caution. Bone morphology cannot resolve the question for Columba livia. The species is exceptionally plastic: size varies enormously depending on climate, diet, and management practices. A population raised primarily for fertilizer production in a desert environment, like the Byzantine-period pigeons documented at Shivta and Saadon in the Negev by Marom and colleagues, stayed small even when clearly domesticated and housed in towers. Apply body-size criteria there and you would miss them entirely. The same metric that works reasonably well for cattle or pigs breaks down almost completely for pigeons. The Hala Sultan Tekke team measured 154 long bones and found all fell within the size range for C. livia, but the assemblage is not clearly distinguishable from a wild population on those grounds alone. What the isotopic and contextual data offer instead is evidence for a commensal relationship that had already tipped toward management. The authors describe this as consistent with the “commensal pathway” to domestication — a process by which animals gradually move into the human niche over many generations, initially attracted by food waste or shelter, and eventually subject to deliberate management. Rock doves naturally nest in rocky outcrops and cliff faces. The ashlar masonry attested at Hala Sultan Tekke suggests the city had multi-story buildings with sheer facades that could have functioned as adequate substitutes. The relevant comparison for dating purposes is Nea Helos, a Hellenistic site in Greece where the earliest previously identified assemblage of morphologically domesticated pigeon bones was recovered, dated to roughly the fourth through first centuries BCE. The Hala Sultan Tekke material predates that by somewhere between nine hundred and a thousand years. A 2023 genomic study identified modern domestic pigeons as most closely related to wild populations from the Middle East, pointing toward at least one domestication event in that region — consistent with the Cypriot evidence but not specifically pinpointed to it. Carter and colleagues are explicit that Hala Sultan Tekke does not represent the origin of pigeon domestication. It represents the earliest direct biomolecular evidence for a commensal human-pigeon relationship that we currently have. The Feast Most of the pigeon bones — 82 percent by minimum number of individuals — came from a single area of the site, City Quarter 1. Within it, a significant concentration was recovered from two interconnected rooms, numbered 70 and 83. These had been flagged during excavation as a cultic space. They contained a large stone structure functioning as a table or altar, burnt deposits of animal remains from multiple species, ceramic vessels representing at least three different production traditions (local Cypriot, Mycenaean, and Canaanite), Egyptian faience beads, gold leaf, a Mycenaean figurine, and carbonized botanical remains including olive, grape, and cereals. The excavators classified these as feasting deposits. Feasting in Bronze Age Cyprus was not incidental. It was structurally embedded — politically, socially, and in mortuary practice. The finds from rooms 70 and 83 have the material profile of repeated formal events: multiple episodes of burning, tableware from across the Mediterranean, architecturally demarcated space. Pigeon bones appear not only in that cultic core but also in wells that served as refuse pits near tomb areas, and in at least one tomb deposit directly. The birds were showing up across the entire social register of the site’s ritual life. Just over half of all the C. livia specimens showed contact with fire. The most parsimonious explanation is that the birds were cooked and eaten, then their bones discarded in the ritual space or burned as part of the offering itself. In birds of this body size, butchery marks are not necessary for consumption and are not expected to be preserved even when the animal was processed — so the absence of cut marks does not complicate the picture. Whether any of this had a direct connection to the cult of Aphrodite, with whom pigeons are closely associated in classical Cypriot tradition, remains an open question. Pigeon and dove figurines appear on Cyprus from the Middle Bronze Age onward, and the island was identified in antiquity as Aphrodite’s birthplace. Her affinity for the birds is well-documented in artistic representations from across the Mediterranean. The paper acknowledges this interpretive framework while noting that no temple or sanctuary has been identified at Hala Sultan Tekke specifically. The cultic deposits are real. Their precise theological affiliation is not resolved. Three individuals in the isotope dataset sat apart from the main grouping, with lower nitrogen values overlapping with wild herbivores rather than with the human range. The authors raise the possibility that these birds came from a different setting — possibly Trypes, a rural site under Hala Sultan Tekke’s administrative control, identified as a probable granary and livestock supplier. Whether they were brought to the city specifically for consumption, or represent pigeons with a more independent relationship to the human environment, the bones do not say. Hala Sultan Tekke was destroyed twice around 1200 to 1150 BCE and then abandoned, its bay having silted up and severed what had been one of the most active trading connections in the eastern Mediterranean. The destruction coincided with the Bronze Age collapse that ended dozens of cities across the region. The pigeons almost certainly outlasted the city. Columba livia is remarkably good at that. Further Reading * Hernández-Alonso, G. et al. (2023). Redefining the evolutionary history of the rock dove, Columba livia, using whole genome sequences. Molecular Biology and Evolution 40. https://doi.org/10.1093/molbev/msad243 * Marom, N. et al. (2018). Pigeons at the edge of the empire: bioarchaeological evidences for extensive management of pigeons in a Byzantine desert settlement in the southern Levant. PLoS ONE 13. https://doi.org/10.1371/journal.pone.0193206 This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.anthropology.net/subscribe [https://www.anthropology.net/subscribe?utm_medium=podcast&utm_campaign=CTA_2]