A computer analysis of symbols inscribed on stone tablets and artifacts more than 4,000 years ago has prompted a new debate on a fiercely contested question: Did the people of the Indus Valley civilization have a written language? According to the researchers who conducted the latest analysis, the answer is yes, and the next step is to search for the grammatical rules governing the language. But other researchers have harsh words for the methods used in the study. “As they say: garbage in, garbage out,” [New Scientist], one critic says.
The Indus civilisation flourished in isolation 4,500 years ago along the border of what is now eastern Pakistan, but almost no historical information exists about the people and their long-lost community. Archaeologists working in the region have unearthed a rich hoard of artifacts, including amulets, seals and ceramic tablets, many of which are embellished with the unusual symbols [The Guardian]. But some researchers contend that the symbols are simply religious or political imagery, and that they don’t add up to a language. They note that most of the inscriptions are extremely short (averaging only four or five symbols), and that few symbols are used repeatedly.
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When the earliest human ancestors left the trees and struck out to make a new life for themselves on the ground, there was no going back, a new study suggests. Researchers examined the ankle bones of those early people and compared them to those of chimpanzees, and say that by 4 million years ago the proto-humans were no longer adapted for skillful tree climbing.
Researchers estimate that the chimpanzee and human lineages split about 5 million to 7 million years ago. Yet experts are divided about what happened next to the first hominins, as members of the human subfamily are called. One group argues–based on evidence that early members of the human line lived in woodland environments and had curved fingers and toes that were good for climbing–that the first hominins spent some time in the trees even as they adapted to their new ground-dwelling lifestyle [ScienceNOW Daily News]. The other faction believes that when humans began to walk upright they quickly lost their arboreal ways, and argues that their arms and legs were more human-like than ape-like.
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About 5,000 years ago the ancient Egyptians were already mixing herbs and tree resins into their wine to make natural medicines, according to a new analysis of the chemical traces left behind in wine jars. The early Egyptians “were living in a world without modern synthetic medicines, and they were very aware of the benefits that natural additives can have—especially if dissolved into an alcoholic medium, like wine or beer,” which breaks down plant alkaloids [National Geographic News], says lead researcher Patrick McGovern, an archaeochemist.
Literary evidence of such drinks had already been brought to light. Ancient Egyptian papyri dating from about 1850 B.C. contained recipes for concoctions to treat a variety of ailments, with many of the recipes involving wine mixed with herbs…. But scientists had not found remnants of any such health-preserving beverages until now [Science News]. The new findings also push back the date at which Egyptians were known to be dabbling in medicinal mixology by more than 1,000 years. The chemical compounds found in the ancient jars may have come from coriander, mint, sage, rosemary, and pine tree resin, researchers say.
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The oldest known fossil of a human child with a skull deformity has been discovered, suggesting that early humans did not kill or abandon their abnormal offspring, as has been commonly assumed. A research team reconstructed the 530,000-year-old skull, the first pieces of which were unearthed in Spain in 2001, and determined that the child likely suffered from craniosynostosis, a debilitating genetic disorder in which some pieces of the skull fuse too quickly, causing pressure to build in the brain [Wired] and interfering with brain development. The severity of the deformity is not clear, but researchers say the child probably had learning difficulties and other mental health issues, and certainly would have required extra care.
The child belonged to the species Homo heidelbergensis, who lived in Europe 800,000 years ago and may have been the direct ancestors of Neanderthals. Humans are thought to be unique in the way they care for sick individuals. Researchers call it conspecific care, but most laypeople would probably call it compassion. Other primates don’t display similar behavior, so we know humans evolved the ability at some point, even if scientists can’t quite pinpoint when. The work could mean that humans as far back as half a million years ago had differentiated from our primate ancestors [Wired].
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Isolated people living in the remote mountains of Cameroon have provided evidence that emotions expressed in Western music are universally recognizable, researchers say. In a new study, researchers found that members of the Mafa tribe could pick out happy, sad, and fearful tunes, despite having no exposure to Western music. Most likely the Mafa were picking up on the same “tone of voice” cues used in human speech, said study team member Stefan Koelsch…. “Western music mimics the emotional features of human speech, using the same melodic and rhythmic structures,” Koelsch said [National Geographic News].
Researchers say the Mafa’s ability to parse the emotions expressed in instrumental classical, jazz, and rock music adds evidence to the theory that music played some role in human evolution. Researchers have proposed numerous hypotheses about why humans make music, ranging from emotional communication to group solidarity. Other scientists, such as Harvard University linguist Steven Pinker, have countered that music is just “auditory cheesecake” with no real evolutionary significance. If music is the result of Darwinian selection, it’s likely that all members of the human species, regardless of their culture, will respond to it in similar ways [ScienceNOW Daily News].
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A clever and painstaking new analysis has revealed that the famous Homo erectus fossil known as Peking Man is 200,000 years older than previously thought. The fossil, discovered almost a century ago during excavations of the Zhoukoudian caves near Beijing, is now thought to be about 750,000 years old. The revised date could change the timeline and number of migrations of the Homo erectus species out of Africa and into Asia [LiveScience].
Homo erectus were the first hominids to leave the evolutionary cradle of Africa. The species had a distinctive barrel-shaped torso and stood [57 to 70 inches] tall, walking upright in a similar way to modern humans [Nature News]. Researchers had previously suggested that one wave of Homo erectus wayfarers migrated out of Africa between 2 million and 1.6 million years ago, settling Indonesia and southern Asia first before moving northward. But new fossil discoveries, coupled with the new dating of Peking Man, are forcing paleoanthropologists to rethink this scenario.
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A top official at Turkey’s science agency reportedly forced the editors of its science magazine to remove a cover story on the life and work of Charles Darwin in what appears to be a sign of the Turkish government’s official discomfort with the theory of evolution.
The article was stripped from the March issue of the widely read popular-science magazine Bilim ve Teknik (Science and Technology) just before it went to press. The magazine, which is published by Turkey’s research funding and science management organization, TÜBİTAK, also switched a planned cover picture of Darwin for an illustration relating to global warming [Nature News]. The editor of the magazine says she was removed from her post over the incident, but has declined to comment further as she’s still an employee of TUBITAK.
The March issue of the magazine, which was intented to celebrate Darwin’s 200th birthday, reached newsstands a week late and 16 pages short. Once the behind-the-scenes machinations became known, academics reacted with outrage. Turkish writer Ender Helvacıoğlu from Science and Future magazine called on the science community to react against this incident and pressure the government, who has the last word appointing the council’s scientific committee. “This intervention can’t be regarded as solely censorship. It connotes the states rejection of science” [Bianet], he wrote. Today a group of university professors were expected to gather at the science council’s headquarters to call for the resignation of the official who ordered the article removed.
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Researchers have peeked inside the brains of religious people responding to statements about God, and found that there’s no discrete part of the brain that handles religious beliefs–there’s no “God spot,” as other neuroscientists have suggested. The new study found that the neural activity in the subjects’ brains corresponded to brain networks known to have other, nonreligious functions…. “There is nothing segregated or conserved or special about religious beliefs, compared to other belief systems,” [lead researcher Jordan] Grafman said. The networks activated by religious beliefs overlap with those that mediate political beliefs and moral beliefs, he said [The New York Times].
The test subjects were read different types of statements dealing with God and religion while their brains were scanned with an fMRI machine, which measures blood flow to different parts of the brain. The scans showed that religious thoughts “light up” the areas of our brain which have evolved most recently, such as those involved in imagination, memory and “theory of mind” – the recognition that other people and living things can have their own thoughts and intentions [New Scientist].
Some researchers have hypothesized that religious beliefs are a byproduct of the neural networks used in theory of mind, suggesting that humans first evolved to imagine what other people are feeling, even people who aren’t present — and from there it was a short step to positing supernatural beings [Wired].
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On the steppes of Central Asia, researchers have found evidence of the earliest “horse farm” dating from 5,500 years ago, pushing back the known domestication of horses by 1,000 years. Those first domesticated horses were probably kept primarily for meat and milk, researchers say, but soon enough new uses emerged, and horse riding revolutionized transport, communications, trade, and warfare. Says study coauthor Sandra Olsen: “To me, the domestication of the horse was a seminal event in human history…. All the major empire builders, like Alexander the Great and Genghis Khan, would have been nothing without horses” [Los Angeles Times].
The evidence of the early farm developed by the ancient Botai people of present-day Kazakhstan includes massive deposits of horse bones, grooved horse teeth that indicate the animals wore bridles, and even the chemical traces of horse milk fats in ceramic pots, says study coauthor Alan Outram. “This is, apart from being fascinating, something of a smoking gun for domestication — would you milk a wild horse?” said Outram [AP]. The people of Kazakhstan and Mongolia still milk mares today to make a fermented, slightly alcoholic drink called “koumiss.”
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About 10 percent of humanity is left-handed (including your humble blogger), but researchers have long wondered why the trait persists, since lefties seem to be at a disadvantage in the evolutionary race. Previous studies have found that lefties have shorter lifespans, shorter stature, and are more likely to be homosexual, three factors that make it more difficult for lefties to attract mates and reproduce. But a new study suggests that in addition to the vaunted creativity of southpaws, lefties may have simply had a tactical advantage throughout human evolution.
The study, which will be published in the Philosophical Transactions of the Royal Society B, surveys the existing literature and weighs the costs and the benefits of being left-handed. The study suggests that lefties have the element of surprise in one-on-one competitions, whether they’re serving tennis balls or attacking their enemies with knives. Study co-author Charlotte Faurie explains that because left-handers are less common, “their opponents will be surprised by the way they fight, and this will provide [lefties] an advantage,” she added. “It’s exactly the same in tennis or in boxing or in any sport where there is face-to-face opposition,” Faurie added [National Geographic News].
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The spit in each person’s mouth contains a diverse and unique universe of bacteria, according to a study in the journal Genome Research, and there’s no geographical pattern to the differences between one mouth and the next. A new worldwide survey of the human saliva microbiome – the bugs in our spit – finds that a man from La Paz, Bolivia, shares no more microbes in common with his neighbours than with a woman from Shanghai [New Scientist].
Molecular anthropologist Mark Stoneking made the discovery while searching for a better way to trace prehistoric human migrations. He had been impressed by how anthropologists were able to trace human migrations through the differences in the strains of the stomach bug Helicobacter pylori in various groups of people…. “With that species, you see very strong geographic patterning,” says Stoneking. But getting a sample of H. pylori is relatively difficult, as it requires a stomach biopsy. He wondered whether any of the bacteria in spit would work instead [ScienceNOW Daily News].
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Being treated unfairly in a game triggers the same facial expression as stomach-turning tastes and images, a new study has found, suggesting that the brain mechanism of disgust evolved to help humans avoid not just rotten food, but also immoral behavior.
“Our idea is that morality builds upon an old mental reflex, said study co-author Adam Anderson…. “The brain had already discovered a system for rejecting things that are bad for it. Then it co-opted this and attached it to conditions much removed from something tasting or smelling bad” [Wired News].
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The ancestors to modern humans really hit their stride 1.5 million years ago. Fossilized footprints found in Kenya were made by hominids that share a common foot anatomy and walking stride with modern humans, researchers say.
Scientists are almost certain that the 1.5-million-year-old prints belong to Homo erectus and that the individuals had heels, insteps and toes almost identical to those in humans, and they walked with a long stride similar to human locomotion…. The prints helped explain fossil and archaeological evidence that erectus had adapted the ability for long-distance walking and running [The New York Times]. There is evidence of a heavy landing on the heel with weight transferred along the outer edge of the foot, progressing to the ball of the foot and lifting off with the toes [BBC].
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The tools found in Colorado resident Patrick Mahaffy’s backyard weren’t the typical collection of weed whackers and shovels. Instead Mahaffy’s yard hosted a collection of chipped stone knives and axes that date from the time of the Clovis people, who are believed to have been among the first inhabitants of America around 13,000 years ago. “The idea that these Clovis-age tools essentially fell out of someone’s yard in Boulder is astonishing,” [anthropologist Douglas Bamforth] said. “But the evidence I’ve seen gives me no reason to believe the cache has been disturbed since the items were placed there for storage about 13,000 years ago” [LiveScience].
The prehistoric tool cache was turned up when landscapers were digging a hole for a fishpond in Mahaffy’s backyard, and struck stone. The collection contains 83 knives, axes, and smaller pieces of flint, and a chemical analysis of blood residue left on the blades revealed that the tools had been used to butcher extinct types of North American camels and horses, and well as bears and sheep.
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Beauty is in the eye of the beholder, and whether that beholding eye belongs to a man or a woman may determine how beauty is processed and understood in the brain, according to a small, preliminary study. Researchers asked 10 men and 10 women to decide which paintings and photographs they found beautiful, while brain scans revealed which parts of their brains were active while they examined each image. The results suggested that while both sexes use parts of the brain associated with spacial awareness to process beauty, men use an area associated with big-picture thinking, while women also use a region linked to local details.
All the volunteers showed increased activity in the parietal lobe when gazing at a landscape or urban scene that they found beautiful, but men used only the right lobe, while women used the lobes on both the left and right sides of the brain. The researchers suggest that this is because women are contextualising the information and thinking more about the details of what they are seeing, assessing the position of objects according broad categories, such as “above” or “below”, or “left” or “right”. The men, they say, are focussing on the overall image using a more precise form of mental mapping [BBC News]. Study coauthor Camilo Cela-Conde hypothesizes that these differences may be linked to the different roles played by men and women throughout our evolution.
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