For this month’s ‘Science Notes’, CA’s Deputy Editor Kathryn Krakowka visited the ancient DNA (aDNA) lab at the Natural History Museum in London, to talk to Professor Ian Barnes and Dr Selina Brace about the history of aDNA research, the functions of the lab at the NHM, and what projects they are currently working on.
In the early days of archaeology, human remains were often treated as an afterthought, deemed unable to tell us much about past populations. As we are well aware today, though, this could not be further from the truth, and in more recent decades the study of human bones has become a major component of archaeological research. But, despite this skeletal success, there is another key aspect of burials that remains relatively under-researched: the grave soil.
In the last decade or so we have experienced a revolution in archaeological science, and one of the most exciting aspects of this is the extraordinary level of detail that we can glean from everyday objects. But while we are constantly pushing the boundaries of what we can discover from archaeological remains, we are also constantly reminded of the constraints we still face. This dichotomy is well evidenced in a study, recently published in the journal Analyst, on the detection of opioids in archaeological contexts.
With the remarkable potential of isotopic analysis making recent headlines (see p.18), it seems apt to talk a bit more about this technique. Among the wealth of archaeological questions isotope analysis can help to answer are: where was an individual born and raised, did they migrate during their lifetimes, what did they predominately eat, and when were they weaned? As this is a relatively new and ever-evolving methodology, though, some of the wrinkles are still being ironed out – and one of the biggest questions currently being explored is whether bone is as effective as teeth in reflecting the isotopic values that a person accumulated in life.
In this month’s Science Notes, we turn to one of the most immediately recognisable monuments in the world – Stonehenge – examining how the origin of its bluestones was taken for granted for so long, and how it shows why research is ever evolving, and never absolute.
While we have talked a lot about ancient DNA (aDNA) in ‘Science Notes’, it has mainly been in the context of decoding ancient human genomes. We have not really delved into the other applications of the methodology, including the detection of ancient pathogens. However, this is a quickly emerging area that could have a huge impact on how we are able to study health and disease in the past, and deserves some unpicking.
In today’s era of ‘fake news’, we haven’t been entirely surprised to see recent headlines claiming new research has proven that radiocarbon dating is inaccurate or plain wrong (one even went so far as to say ‘A Crucial Archaeological Dating Tool is Wrong, and It Could Change History as We Know It’). To be fair, once you get past the headlines, the articles mostly provide a bit more of the truth and a little less clickbait. Nonetheless, we thought it pertinent to delve into the actual science of this discovery and offer a more impartial, if less sensationalist, account of the findings.
This month we are doing something a little different, exploring a wider theme rather than a specific technique. A recent public-interest piece in Nature – published in response to their research paper about the Bell Beaker culture (for more on this research, see CA 338) – discusses the ‘sometimes straining’ relationship between archaeologists and geneticists.
In this month’s ‘Science Notes’, we are discussing yet another form of dating: uranium-thorium (U-Th) dating, also known as uranium-series dating. Readers may already be aware of the technique, as it has featured a few times in research covered by CA over the years (see CA 83, 93, and 259), but recently it made international headlines for its use in determining that cave paintings in Iberia pre-date the presence of modern humans.
The application of proteomics, or the analysis of proteins, to archaeology is a fairly recent phenomenon – it only became viable thanks to developments in high-throughput, high-resolution tandem mass spectrometry – and archaeological scientists are only just beginning to scratch the surface of the many ways in which this technique might be used. Its potential is exciting, however.