November 8, 2008
On the surface, plummeting populations of sharks do not seem like much cause for concern for humans or, for that matter, other sea life. But this simple viewpoint relies on splitting animals into two groups - predators and prey. In practice, this distinction is far too crude. Too put it bluntly,…
November 6, 2008
They say that a poor workman blames his tools but according to a new study, laboratory scientists may well have cause to. Reid Macdonald from the University of Alberta has found that some botched experiments may be due to chemicals leaching from the very plastic tubes that scientists use on an…
November 6, 2008
Specific language impairment (SLI) is a language disorder that affects growing children, who find it inexplicably difficult to pick up the spoken language skills that their peers acquire so effortlessly. Autism is another (perhaps more familiar) developmental disorder and many autistic children…
November 5, 2008
If you want to drive someone away, then throwing up on them is probably going to do the trick. But the caterpillars of the small mottled willow moth (aka the beet armyworm; Spodoptera exigua) take defensive vomiting to a whole new level. Their puke is both detergent and chemical weapon; its goal is…
November 4, 2008
You are the alpha male, the top dog, the grand kahuna. A young upstart is trying to muscle his way onto your turf and compete for your women. Your solution - click your knees loudly at him. It seems like a strange strategy. For humans, a clicking knee would hardly be a sign of strength but it's all…
November 4, 2008
With current technology, could we clone a mammoth? Cloning techniques have made significant progress in recent years and at least one well-preserved specimen has been found. But the same freezing process that preserves the bodies of many extinct mammals would also be the undoing of cloning…
November 3, 2008
Mammals like ourselves pass our genes 'vertically' from parent to child. But bacteria aren't quite so limited; they have mastered the art of gene-swapping and regularly transfer DNA 'horizontally' from one cell to another. This "horizontal gene transfer" has been largely viewed as a trademark of…
November 1, 2008
In the heart of Bolivia, an Amazonian society is losing its traditional knowledge of the medicinal value of local plants, to the detriment of its children's health. The Tsimane' are a small seven thousand-strong population living in a lowland region of Bolivia, who possess tremendous knowledge…
October 31, 2008
So as I said, I will be posting wildlife pictures from my recent Australian adventure on a weekly basis. We begin with that most obvious of Australian critters - the koala. Unfortunately, we never managed to see one of these in the wild so these photos come from the Healesville Sanctuary and the…
October 29, 2008
Our amphibians are not doing well. Populations of frogs, toads, salamanders and newts the world over are falling dramatically. Their moist, permeable skins and their need for water to reproduce make them vulnerable to a multitude of threats including drought brought on by climate change, a deadly…
October 27, 2008
Most of the planet's ecosystems are made of a multitude of different species, rich tangles of living things all interacting, competing and cooperating in order to eke out an existence. But not always - in South Africa, within the darkness of a gold mine, there is an ecosystem that consists of a…
October 26, 2008
We will readily describe a person's demeanour as "warm" or "cold" but this link between temperature and personality is more than just a metaphorical one. A new study shows that warming a person's fingertips can also bring out the warmth in their social relationships, pushing them to judge others…
October 25, 2008
G'day. As of yesterday, my month-long jaunt to Australia was officially over, which means that your friendly neighbourhood science blog will continue its regular service, with new posts starting tomorrow.
The holiday was amazing - we managed to pack in some time in Sydney and Melbourne, a sailing…
October 25, 2008
Animals often show a keen intelligence and many species, from octopuses to crows, can perform problem-solving tasks. But humans are thought to go one step further. We can reflect on our own thoughts and we have knowledge about our knowledge. We can not only solve problems, but we know in…
October 24, 2008
Evolution mostly involves small, gradual changes, and for good reason - we might expect that large changes to an animal's genetic code, and therefore to its body plan, simply wouldn't work. It would be like shoving an extra cog into a finely-tuned machine and expecting it to fit in - the more…
October 23, 2008
The plague, or the Black Death, is caused by a microbe called Yersinia pestis. In the 14th century, this microscopic enemy killed off a third of Europe's population. While many people consign the plague to centuries past, this attitude is a complacent one. Outbreaks have happened in Asia and…
October 22, 2008
Humans are a funny lot. While we seem to be relentless voyeurs, we generally frown on eavesdropping as an invasion of privacy. But in the animal world, eavesdropping can be a matter of life or death. Animals rarely communicate in isolation. Often it pays for one species to monitor the…
October 21, 2008
Fighting malaria with mosquitoes seems like an bizarrely ironic strategy but it's exactly what many scientists are trying to do. Malaria kills one to three million people every year, most of whom are children. Many strategies for controlling it naturally focus on ways of killing the mosquitoes…
October 20, 2008
Moving robots are becoming more and more advanced, from Honda's astronaut-like Asimo to the dancing Robo Sapien, a perennial favourite of Christmas stockings. But these advances are still fairly superficial. Most robots still move using pre-defined programmes and making a single robot switch…
October 19, 2008
We've all acted impulsively before, and we have the horrendous clothes, echoing bank accounts and hilarious memories to show for it. But science is beginning to show that impulsive people may be particularly vulnerable to drug addiction, and there is little funny or harmless about that.…
October 18, 2008
A virus, like any other carrier of genetic information, can only enjoy evolutionary success by ensuring that its genetic material is passed on through the ages, and it can only do that if its offspring finds new hosts to infect. Its host must live to infect again, and the virus that kills its…
October 17, 2008
In the Ivory Coast, a small stream called Audrenisrou winds its way through the lowland rainforest of the Tai National Park. On the floodplain of this stream, at a site called Nuolo, lie several stones that seem unassuming at first glance. But to the trained eye, they are a window to the past…
October 16, 2008
Looking at Britain's overcrowded prisons, Wembley stadium or the continual dithering over solid climate change policies, it would seem that many of us are really quite bad at planning for the future. Even so, most of us can still do it (even though some may do it very badly). This abilty isn't…
October 15, 2008
It is midday in Senegal and a chimpanzee is on the hunt. Its target is a bushbaby, a small, cute and nocturnal primate that spends its days sheltered in the hollow of a tree, beyond the reach of predators like the chimp. But this hunter is not like others - it is intelligent, it is dextrous,…
October 14, 2008
I have only ever seen one car crash and I remember it with crystal clarity. I was driving home along a motorway and a car heading the opposite way simply veered into the central reservation. Its hood crumpled like so much paper, its back end lifted clear off the tarmac and it spun 180 degrees…
October 13, 2008
Many animals use poisonous secretions to protect themselves from predators. But poisons are complex chemicals and can take a lot of energy to make. Why invest in them, when you can steal someone else's?
Poison thieves are well-known in the animal kingdom. Many species of brightly coloured…
October 12, 2008
It's mid-October. For most of us, our New Year's resolutions have long been forgotten and our bad habits remain frustratingly habitual. The things that are bad for us often feel strongly compelling, be they high-fat foods, gambling or alcohol. And nowhere is the problem of addiction more…
October 11, 2008
While philosophers and poets muse on the meaning of life, natural selection casts a dispassionate eye on the whole affair. From the viewpoint of evolution, there is only one thing that matters - that we survive long enough to pass our genes on to the next generation, as many times as possible…
October 10, 2008
The twenty-first century is having a troubled infancy. Eight years in and it is facing the twin perils of climate change and a looming energy crisis. Solutions to both are in high demand and many research dollars and pounds are being channelled into developing environmentally-friendly, renewable…
October 9, 2008
Throughout the day, our skins are constantly sending out messages that we are completely oblivious to. The message is written in chemical form and it says, "Here I am. Come and get me". We neither see nor hear these signals but other creatures do, and they slither, crawl and swim our way in…
