Humans

A shell from a snail in the family Achatinidae, similar to those thought to have been cooked at Border Cave in South AfricaMarine Wojcieszak
Broken bits of shells found in a cave in South Africa have given researchers the earliest evidence for prehistoric people roasting and eating snails.
Other studies have pointed to snail consumption at sites in Europe around 30,000 years ago and in Africa around 40,000 years ago. “There is a huge gap from that to our findings,” says Marine Wojcieszak, who did the new work while … More

Stone Age hunter-gatherers had children with farmers in EuropeAlamy Stock Photo
The offspring of Stone Age farmers that settled in Europe inherited an unusually high share of immunity genes from local hunter-gatherers, suggesting that the development of farming wasn’t the sole reason early humans became more resistant to pathogens.
It has long been thought that ancient farmers would have had improved immune systems over hunter-gatherers, due to living in more densely populated conditions and having closer contact with animals, increasing exposure to pathogens. As these farming populations expanded, their immunity genes would be best adapted and passed to their offspring.
But the story is more complex than that. “These early farming groups came into Europe, bringing their lifestyle and technology, but there [were] also hunter-gatherers in Europe,” says Pontus Skoglund at the Francis Crick Institute in London, and the two populations mixed.Advertisement
To learn more, Skoglund and his colleagues analysed the genomes of 677 ancient individuals from across western Eurasia, spanning from approximately 12,000 to 5000 years ago.
The team divided the genomes into three groups: early farmers who had moved west from the region now occupied by Turkey and the Balkans, European hunter-gatherers and later individuals with mixed inheritance. “Fast forward a few millennia, and the remaining farming groups now have about 20 per cent of their ancestry that can be traced back to hunter-gatherers,” says Skoglund.
But in a specific genome region, called the major histocompatibility complex (MHC), this split was closer to 50:50, suggesting that hunter-gatherer genes here were more favoured by selection processes. The MHC contains many genes for adaptive immunity, which is how the body targets specific pathogens, but exactly why the hunter-gatherer genes were selected for is unclear, says Skoglund.
The simplest explanation is that hunter-gatherers may have been better adapted to pathogens in western Europe, so their genes provided an advantage once the farmers had settled there.
But there is an alternative, thanks to a quirk of evolution that means groups that generally pass on a minority of their genes, like the hunter-gatherers, can provide more genes for functions where diversity is important, such as immunity – where the most successful offspring will be those that can survive a range of diseases.

The MHC plays a large role in determining whether we can survive a particular infection, says Mark Thomas at University College London, who wasn’t involved in the work. “So, from an evolutionary point of view, it makes sense that we’re very diverse for MHC. It means we can fight off more pathogens,” he says.

Topics:genetics/farming More

The Picture Pantry/Alamy
IS THERE any fruit more useful than a lemon? The citric acid in its juice can provide a touch of sharpness that improves a vast range of dishes. The fragrant oil concentrated in the peel of lemons has an aroma so appealing that we add it to cleaning products. It is also a good source of vitamin C: once its power to prevent scurvy was discovered in the 1750s, it led to a boom in demand for lemons.
The family history of citrus fruits is complex and uncertain, but genomic studies suggest that lemons are a hybrid of a … More

Hand stencils with missing digits at Cosquer cave in Marseille, FrancePatrick Aventurier/getty images
DEEP inside Gargas cave in the Pyrenees mountains of southern France is something that has puzzled every visitor who has made the journey into its dark inner chambers. Among prehistoric paintings and engravings of horses, bison and mammoths are hundreds of stencils made tens of thousands of years ago by people spitting red and black paint over their outstretched hands. Such motifs are found at ancient sites around the world, from Australia to the Americas and from Indonesia to Europe. For years, archaeologists have wondered at their meaning. But those in Gargas are especially mysterious because around half of the hands appear to be injured.
“It’s very obvious that some of the fingers are missing,” says Aritz Irurtzun at the National Centre for Scientific Research (CNRS) in Bayonne, France. So-called mutilated hands can be seen at many other prehistoric rock art sites, but Gargas cave is the most striking example of this phenomenon.
It has been suggested that these missing fingers are the result of accidents, frostbite or ritual mutilation. Another possibility is that their creators deliberately folded away their fingers to produce specific patterns. Irurtzun and Ricardo Etxepare, also at CNRS, have now found a way to test this idea. What they have discovered convinces them that Gargas’s hand stencils reflect a Stone Age sign language. If so, these patterns add to a growing body of evidence suggesting that Palaeolithic cave paintings may contain a variety of hidden codes. The Gargas stencils could even represent the oldest … More

Most of the ideas of Anaximander (second from right) have come to us through the writing of AristotleElla_Ca/shutterstock
Anaximander and the Nature of ScienceCarlo Rovelli (translated by Marion Lignana Rosenberg)(Allen Lane)
ASTRONOMY was conducted at Chinese government institutions for more than 20 centuries before Jesuit missionaries turned up and, somewhat bemused, pointed out that Earth is round. Why, after so much close observation and meticulous record-keeping, did 17th-century Chinese astronomers still think Earth was flat?
Theoretical physicist Carlo Rovelli addresses this in Anaximander and the Nature of Science, … More

A 3D representation of the wreck site is shown in this photogrammetry image from the Maritime Archaeology Trust.Norfolk Historic Shipwrecks Ltd
THIS intriguing selection of images documents a catastrophic shipwreck that, after more than 300 years, has had some of its relics brought to the surface. They will be showcased in a new exhibition, The Last Voyage of the Gloucester, by the University of East Anglia and Norwich Castle Museum and Art Gallery, both in the UK.
1682 painting of the wreck by Johan Danckerts.Royal Museums Greenwich/Wikimedia Commons
In 1682, the warship HMS Gloucester set sail for Edinburgh carrying the future King James II of England and Ireland, who was also King James VII of Scotland. Not long into its journey, the ship struck a sandbank off the Norfolk coast and sank. James survived, but some 250 people on board died.Advertisment

It wasn’t until 2007 that the miraculously well-preserved shipwreck was discovered by brothers Julian and Lincoln Barnwell, who had spent years scuba diving in search of the vessel. However, the pair were unable to reveal their find until last year so it could be protected.
The ship’s lifting tools on the seabed
A 3D representation of the wreck site is shown in the main picture in a photogrammetry image from the Maritime Archaeology Trust.

Pictured above: a pair of glasses in their case; and below two salt-glazed jugs, known as Bellarmine bottles; and a “Sun in Splendour” bottle. All were found at the site.
Two salt-glazed jugs, known as Bellarmine bottles, left; and a “Sun in Splendour” rightNorfolk Historic Shipwrecks
Pictured below the 65-kilogram bronze bell of HMS Gloucester.

The exhibition is at Norwich Castle Museum and Art Gallery until 10 September.

Topics:archaeology/ships More

Patti Perret/Sony pictures
Watch
65 sees astronaut Mills (Adam Driver, pictured above) and a crew crash on an unknown planet – with dinosaurs. The sci-fi thriller, by Scott Beck and Bryan Woods (writers of A Quiet Place), is showing in cinemas from 10 March.

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The Biomimicry Revolution points us towards sustainable ways of living on Earth. Henry Dicks, an environmental philosopher, surveys our use of nature’s strategies to improve our surroundings. On sale from 14 March.
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The Use of Algorithms in Society is complex, says Cass Sunstein (pictured above), policy adviser and co-author of the bestseller … More

Jeffrey Cirio as the Creature, in a still from Asif Kapadia’s film adaptation of the ballet Creature.Courtesy BFI Distribution and English National Ballet
Creature
Asif Kapadia
On limited release in the UK and Ireland

In an isolated research station, lost amid snow and ice, a highly disciplined team of would-be astronauts is putting an experimental animal through its paces. Will the Creature (deliberately left ambiguous so as not to spoil things) survive the tests thrown at it: the cold, the isolation, the asphyxia?
This is a science-fiction ballet (adapted for film) loosely based on 19th-century dramatist Georg … More