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‘Bone biographies’ reveal lives of medieval England’s common people — and illuminate early benefits system
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A series of ‘bone biographies’ created by a major research project tell the stories of medieval Cambridge residents as recorded on their skeletons, illuminating everyday lives during the era of Black Death and its aftermath.
University of Cambridge archaeologists analysed close to 500 skeletal remains excavated from burial grounds across the city, dating between the 11th and 15th centuries. Samples came from a range of digs dating back to the 1970s.
The latest techniques were used to investigate diets, DNA, activities, and bodily traumas of townsfolk, scholars, friars and merchants. Researchers focused on sixteen of the most revealing remains that are representative of various “social types.”
The full “osteobiographies” are available on a new website launched by the After the Plague project at Cambridge University.
“An osteobiography uses all available evidence to reconstruct an ancient person’s life,” said lead researcher Prof John Robb from Cambridge’s Department of Archaeology. “Our team used techniques familiar from studies such as Richard III’s skeleton, but this time to reveal details of unknown lives — people we would never learn about in any other way.”
“The importance of using osteobiography on ordinary folk rather than elites, who are documented in historical sources, is that they represent the majority of the population but are those that we know least about,” said After the Plague researcher Dr Sarah Inskip (now at University of Leicester).
The project used a statistical analysis of likely names drawn from written records of the period to give pseudonyms to the people studied.
“Journalists report anonymous sources using fictitious names. Death and time ensure anonymity for our sources, but we wanted to them to feel relatable,” said Robb.
Meet 92 (‘Wat’), who survived the plague, eventually dying as an older man with cancer in the city’s charitable hospital, and 335 (‘Anne’), whose life was beset by repeated injuries, leaving her to hobble on a shortened right leg.
Meet 730 (‘Edmund’), who suffered from leprosy but — contrary to stereotypes — lived among ordinary people, and was buried in a rare wooden coffin. And 522 (‘Eudes’), the poor boy who grew into a square-jawed friar with a hearty diet, living long despite painful gout.
Inside the medieval benefits system
The website coincides with a study from the team published in the journal Antiquity, which investigates the inhabitants of the hospital of St. John the Evangelist.
Founded around 1195, this institution helped the “poor and infirm,” housing a dozen or so inmates at any one time. It lasted for some 300 years before being replaced by St. John’s College in 1511. The site was excavated in 2010.
“Like all medieval towns, Cambridge was a sea of need,” said Robb. “A few of the luckier poor people got bed and board in the hospital for life. Selection criteria would have been a mix of material want, local politics, and spiritual merit.”
The study gives an inside look at how a “medieval benefits system” operated. “We know that lepers, pregnant women and the insane were prohibited, while piety was a must,” said Robb. Inmates were required to pray for the souls of hospital benefactors, to speed them through purgatory. “A hospital was a prayer factory.”
Molecular, bone and DNA data from over 400 remains in the hospital’s main cemetery shows inmates to be an inch shorter on average than townsfolk. They were more likely to die younger, and show signs of tuberculosis.
Inmates were more likely to bear traces on their bones of childhoods blighted by hunger and disease. However, they also had lower rates of bodily trauma, suggesting life in the hospital reduced physical hardship or risk.
Children buried in the hospital were small for their age by up to five years’ worth of growth. “Hospital children were probably orphans,” said Robb. Signs of anaemia and injury were common, and about a third had rib lesions denoting respiratory diseases such as TB.
As well as the long-term poor, up to eight hospital residents had isotope levels indicating a lower-quality diet in older age, and may be examples of the “shame-faced poor”: those fallen from comfort into destitution, perhaps after they became unable to work.
“Theological doctrines encouraged aid for the shame-faced poor, who threatened the moral order by showing that you could live virtuously and prosperously but still fall victim to twists of fortune,” said Robb.
The researchers suggest that the variety of people within the hospital — from orphans and pious scholars to the formerly prosperous — may have helped appeal to a range of donors.
Finding the university scholars
The researchers were also able to identify some skeletons as probably those of early university scholars. The clue was in the arm bones.
Almost all townsmen had asymmetric arm bones, with their right humerus (upper arm bone) built more strongly than their left one, reflecting tough working regimes, particularly in early adulthood.
However, about ten men from the hospital had symmetrical humeri, yet they had no signs of a poor upbringing, limited growth, or chronic illness. Most dated from the later 14th and 15th century.
“These men did not habitually do manual labour or craft, and they lived in good health with decent nutrition, normally to an older age. It seems likely they were early scholars of the University of Cambridge,” said Robb.
“University clerics did not have the novice-to-grave support of clergy in religious orders. Most scholars were supported by family money, earnings from teaching, or charitable patronage.
“Less well-off scholars risked poverty once illness or infirmity took hold. As the university grew, more scholars would have ended up in hospital cemeteries.”
Isotope work suggests the first Cambridge students came mainly from eastern England, with some from the dioceses of Lincoln and York.
Cambridge and the Black Death
Most remains for this study came from three sites. In addition to the Hospital, an overhaul of the University’s New Museums Site in 2015 yielded remains from a former Augustinian Friary, and the project also used skeletons excavated in the 1970s from the grounds of a medieval parish church: ‘All Saints by the Castle’.
The team laid out each skeleton to do an inventory, then took samples for radiocarbon dating and DNA analysis. “We had to keep track of hundreds of bone samples zooming all over the place,” said Robb
In 1348-9 the bubonic plague — Black Death — hit Cambridge, killing between 40-60% of the population. Most of the dead were buried in town cemeteries or plague pits such as one on Bene’t Street next to the former friary.
However, the team have used the World Health Organization’s methods of calculating “Disease Adjusted Life Years” — the years of human life and life quality a disease costs a population — to show that bubonic plague may have only come in tenth or twelfth on the risk rundown of serious health problems facing medieval Europeans.
“Everyday diseases, such as measles, whooping cough and gastrointestinal infections, ultimately took a far greater toll on medieval populations,” said Robb.
“Yes, the Black Death killed half the population in one year, but it wasn’t present in England before that, or in most years after that. The biggest threats to life in medieval England, and in Western Europe as a whole, were chronic infectious diseases such as tuberculosis.”
NOTES:
- Medieval Cambridge was home to just a few thousand people, with timber-framed houses clustered around a dozen churches, each with a small cemetery. A ten-minute walk in any direction ended in fields worked by many of the locals.
- Major Christian orders — such as Dominicans and Franciscans — had bases in the town, and the early University consisted of large hostels for religious students, with the first college, Peterhouse, established in 1284.
- Initially small and relatively poor, the colleges start to grow and multiply by the later 14th century thanks to endowments from aristocrats and royalty. By 1400 there were between 4-700 scholars.
- Remains from “All Saints by the Castle,” as well as from surrounding villages, had been in storage for decades, with some housed in the University’s Duckworth Laboratory, and others held in an old salt mine in Cheshire.
- Analyses of townsfolk from the “All Saints” cemetery suggest an adequate diet, mainly grains, vegetables and a little dairy. Around half of this group did not survive childhood, but of those that did, around half made it past the age of 45.
- Men from the Augustinian Friary were around an inch taller than those from town, with bone chemistry suggesting diets rich with meat and fish. The hospital inmates were the shortest group, likely as a result of poor and disease-ridden childhoods.
- Three people from the hospital, including 332 (‘Christina’), began life some distance away, maybe even as far as Norway. They may have been buried in the Hospital cemetery’s consecrated ground as an act of charity, after dying while visiting Cambridge — perhaps to trade at the town’s famous Stourbridge Fair.
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‘Ice bucket challenge’ reveals that bacteria can anticipate the seasons
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Bacteria use their internal 24-hour clocks to anticipate the arrival of new seasons, according to research carried out with the assistance of an ‘ice bucket challenge.’
The team behind the findings gave populations of blue-green algae (cyanobacteria) different artificial day lengths at a constant warm temperature. Samples on plates received either short days, equinox days (equal light and dark), or long days, for eight days.
After this treatment, the blue-green algae were plunged into ice for two hours and survival rates monitored.
Samples that had been exposed to a succession of short days (eight hours light and 16 hours dark) in preparation for the icy challenge achieved survival rates of 75%, up to three times higher than colonies that had not been primed in this way.
One short day was not enough to increase the bacteria’s resistance to cold. Only after several short days, and optimally six to eight days, did the bacteria’s life chances significantly improve.
In cyanobacteria which had genes that make up their biological clock removed, survival rates were the same regardless of day lengths. This indicates that photoperiodism (the ability to measure the day-night cycle and change one’s physiology in anticipation of the upcoming season) is critical in preparing bacteria for longer-term environmental changes such as a new season or shifts in climate.
“The findings indicate that bacteria in nature use their internal clocks to measure day length and when the number of short days reaches a certain point, as they do in autumn/fall, they ‘switch’ to a different physiology in anticipation of the wintry challenges that lie ahead,” explained first author of the study, Dr Luísa Jabbur, who was a researcher at Vanderbilt University, Tennessee, in the laboratory of Prof. Carl Johnson when this study took place, and is now a BBSRC Discovery Fellow at the John Innes Centre.
The Johnson lab has a long history of studying the circadian clock of cyanobacteria, both from a mechanistic and an ecological perspective.
Previous studies have shown that bacteria have a version of a biological clock, which could allow them to measure differences in day-night length, offering an evolutionary advantage.
This study, which appears in Science, is the first time that anyone has shown that photoperiodism in bacteria has evolved to anticipate seasonal cues.
Based on these findings a whole new horizon of scientific exploration awaits. A key question is: how does an organism with a lifespan of between six and 24 hours evolve a mechanism that enables it not merely to react to, but to anticipate, future conditions?
“It’s like they are signalling to their daughter cells and their granddaughter cells, passing information that the days are getting short, you need to do something,” said Dr Jabbur.
Dr Jabbur and colleagues at the John Innes Centre will, as part of her BBSRC Discovery Fellowship, use cyanobacteria as a fast-reproducing model species to understand how photoperiodic responses might evolve in other species during climate change, with hopeful applications to major crops.
A key part of this work will be to understand more about the molecular memory systems by which information is passed from generation to generation in species. Research will investigate the possibility that an accumulation of compounds during the night on short days acts as a molecular switch that triggers change to a different physiology or phenotype.
For Dr Jabbur the findings amount to an early-career scientific breakthrough in the face of initial scepticism from her scientific mentor and the corresponding author of the paper, Professor Carl Johnson.
“As well as being a fascinating person and an inspiration, Carl sings in the Nashville Symphony Chorus, and he has an operatic laugh! It echoed round the department when I first outlined my idea for the icy challenge, to see if photoperiod was a cue for cyanobacteria in their natural element,” said Dr Jabbur.
“To be fair he told me to go away and try it, and as I went, he showed me a sign on his door with the Frank Westheimer quote: ‘Progress is made by young scientists who carry out experiments that old scientists say would not work.’
“It did work, first time. Then I repeated the experiments. There is something very precious about looking at a set of plates with bacteria on them and realizing that in that moment you know something that nobody else knows.”
Bacteria can anticipate the seasons: Photoperiodism in cyanobacteria appears in Science.
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New filtration material could remove long-lasting chemicals from water
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Water contamination by the chemicals used in today’s technology is a rapidly growing problem globally. A recent studyby the U.S. Centers for Disease Control found that 98 percent of people tested had detectable levels of PFAS, a family of particularly long-lasting compounds, also known as forever chemicals, in their bloodstream.
The findings are described in the journal ACS Nano, in a paper by MIT postdoc Yilin Zhang, professor of civil and environmental engineering Benedetto Marelli, and four others from MIT.
PFAS chemicals are present in a wide range of products, including cosmetics, food packaging, water-resistant clothing, firefighting foams, and antistick coating for cookware. A recent study identified 57,000 sites contaminated by these chemicals in the U.S. alone. The U.S. Environmental Protection Agency has estimated that PFAS remediation will cost $1.5 billion per year, in order to meet new regulations that call for limiting the compound to less than 7 parts per trillion in drinking water.
Contamination by PFAS and similar compounds “is actually a very big deal, and current solutions may only partially resolve this problem very efficiently or economically,” Zhang says. “That’s why we came up with this protein and cellulose-based, fully natural solution,” he says.
“We came to the project by chance,” Marelli notes. The initial technology that made the filtration material possible was developed by his group for a completely unrelated purpose — as a way to make a labelling system to counter the spread of counterfeit seeds, which are often of inferior quality. His team devised a way of processing silk proteins into uniform nanoscale crystals, or “nanofibrils,” through an environmentally benign, water-based drop-casting method at room temperature.
Zhang suggested that their new nanofibrillar material might be effective at filtering contaminants, but initial attempts with the silk nanofibrils alone didn’t work. The team decided to try adding another material: cellulose, which is abundantly available and can be obtained from agricultural wood pulp waste. The researchers used a self-assembly method in which the silk fibroin protein is suspended in water and then templated into nanofibrils by inserting “seeds” of cellulose nanocrystals. This causes the previously disordered silk molecules to line up together along the seeds, forming the basis of a hybrid material with distinct new properties.
By integrating cellulose into the silk-based fibrils that could be formed into a thin membrane, and then tuning the electrical charge of the cellulose, the researchers produced a material that was highly effective at removing contaminants in lab tests.
The electrical charge of the cellulose, they found, also gave it strong antimicrobial properties. This is a significant advantage, since one of the primary causes of failure in filtration membranes is fouling by bacteria and fungi. The antimicrobial properties of this material should greatly reduce that fouling issue, the researchers say.
“These materials can really compete with the current standard materials in water filtration when it comes to extracting metal ions and these emerging contaminants, and they can also outperform some of them currently,” Marelli says. In lab tests, the materials were able to extract orders of magnitude more of the contaminants from water than the currently used standard materials, activated carbon or granular activated carbon.
While the new work serves as a proof of principle, Marelli says, the team plans to continue working on improving the material, especially in terms of durability and availability of source materials. While the silk proteins used can be available as a byproduct of the silk textile industry, if this material were to be scaled up to address the global needs for water filtration, the supply might be insufficient. Also, alternative protein materials may turn out to perform the same function at lower cost.
Initially, the material would likely be used as a point-of-use filter, something that could be attached to a kitchen faucet, Zhang says. Eventually, it could be scaled up to provide filtration for municipal water supplies, but only after testing demonstrates that this would not pose any risk of introducing any contamination into the water supply. But one big advantage of the material, he says, is that both the silk and the cellulose constituents are considered food-grade substances, so any contamination is unlikely.
“Most of the normal materials available today are focusing on one class of contaminants or solving single problems,” Zhang says. “I think we are among the first to address all of these simultaneously.”
The research team included MIT postdocs Hui Sun and Meng Li, graduate student Maxwell Kalinowski, and recent graduate Yunteng Cao PhD ’22, now a postdoc at Yale. The work was supported by the Office of Naval Research, the National Science Foundation, and the Singapore-MIT Alliance for Research and Technology.
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‘Some pterosaurs would flap, others would soar’ — new study further confirms the flight capability of these giants of the skies
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Some species of pterosaurs flew by flapping their wings while others soared like vultures, demonstrates a new study published in the peer-reviewed Journal of Vertebrate Paleontology.
However, “remarkable” and “rare” three-dimensional fossils of two different large-bodied azhdarchoid pterosaur species — including one new-to-science — have enabled scientists to hypothesize that not only could the largest pterosaurs take to the air, but their flight styles could differ too.
The new findings are led by experts from the University of Michigan, in the US, the Natural Resources Authority and Yarmouk University, in Jordan, and the Saudi Geological Survey, in Saudi Arabia.
Their paper details how these fossils — which date back to the latest Cretaceous period (approximately 72 to 66 million years ago) — were remarkably three-dimensionally preserved within the two different sites that preserve a nearshore environment on the margin of Afro-Arabia, an ancient landmass that included both Africa and the Arabian Peninsula. The research team used high-resolution computed tomography (CT) scans to then analyze the internal structure of the wing bones.
“The dig team was extremely surprised to find three-dimensionally preserved pterosaur bones, this is a very rare occurrence,” explains lead author Dr Kierstin Rosenbach, from the Department of Earth and Environmental Sciences of the University of Michigan.
“Since pterosaur bones are hollow, they are very fragile and are more likely to be found flattened like a pancake, if they are preserved at all.
“With 3D preservation being so rare, we do not have a lot of information about what pterosaur bones look like on the inside, so I wanted to CT scan them.
“It was entirely possible that nothing was preserved inside, or that CT scanners were not sensitive enough to differentiate fossil bone tissue from the surrounding matrix.”
Luckily, though, what the team uncovered was “remarkable,” via “exciting internal structures not only preserved, but visible in the CT scanner.”
CT scans reveal one soars; one flaps!
Newly collected specimens of the already-known giant pterosaur, Arambourgiania philadelphiae, confirm its 10-meter wingspan and provide the first details of its bone structure. CT images revealed that the interior of its humerus, which is hollow, contains a series of ridges that spiral up and down the bone.
This resembles structures in the interior of wing bones of vultures. The spiral ridges are hypothesized to resist the torsional loadings associated with soaring (sustained powered flight that requires launch and maintenance flapping).
The other specimen analyzed was the new-to-science Inabtanin alarabia, which had a five-meter wingspan. The team named it after the place where it was excavated — near a large grape-colored hill, called Tal Inab. The generic name combines the Arabic words “inab,” for grape, and “tanin” for dragon. ‘Alarabia’ refers to the Arabian Peninsula.
Inabtanin is one of the most complete pterosaurs ever recovered from Afro-Arabia, and the CT scans revealed the structure of its flight bones was completely different from that of Arambourgiania.
The interior of the flight bones were crisscrossed by arrangement with struts that match those found in the wing bones of modern flapping birds.
This indicates it was adapted to resist bending loads associated with flapping flight, and so it is likely that Inabtanin flew this way — although this does not preclude occasional use of other flight styles too.
“The struts found in Inabtanin were cool to see, though not unusual,” says Dr Rosenbach.
“The ridges in Arambourgiania were completely unexpected, we weren’t sure what we were seeing at first!
“Being able to see the full 3D model of Arambourgiania’s humerus lined with helical ridges was just so exciting.”
What explains this difference?
The discovery of diverse flight styles in differently-sized pterosaurs is “exciting,” the experts state, because it opens a window into how these animals lived. It also poses interesting questions, like to what extent flight style is correlated with body size and which flight style is more common among pterosaurs.
“There is such limited information on the internal bone structure of pterosaurs across time, it is difficult to say with certainty which flight style came first,” Dr Rosenbach adds.
“If we look to other flying vertebrate groups, birds and bats, we can see that flapping is by far the most common flight behavior.
“Even birds that soar or glide require some flapping to get in the air and maintain flight.
“This leads me to believe that flapping flight is the default condition, and that the behavior of soaring would perhaps evolve later if it were advantageous for the pterosaur population in a specific environment; in this case the open ocean.”
Co-author Professor Jeff Wilson Mantilla, Curator at Michigan’s Museum of Paleontology, and Dr Iyad Zalmout, from the Saudi Geological Survey, found these specimens in 2007 at sites in the north and south of Jordan.
Professor Jeff Wilson Mantilla says the “variations likely reflect responses to mechanical forces applied on the pterosaurs’ wings during flight.”
Enabling further study of vertebrate flight
Concluding, Dr Rosenbach states: “Pterosaurs were the earliest and largest vertebrates to evolve powered flight, but they are the only major volant group that has gone extinct.
“Attempts to-date to understand their flight mechanics have relied on aerodynamic principles and analogy with extant birds and bats.
“This study provides a framework for further investigation of the correlation between internal bone structure and flight capacity and behavior, and will hopefully lead to broader sampling of flight bone structure in pterosaur specimens.”
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