Naked Scientists Special Editions

Passwords are a tricky business, with thousands of people forgetting them every day, and some being hacked or guessed. The University of York has tested the idea of using recognisable faces which are unique to us, instead of written passwords, as proof of our identity. Rob Jenkins, a psychologist who lead the study, tells Kat Arney more...

Whooping cough, also known as pertussis or the '100 day cough', kills around 300,000 people per year, but is one of the most common diseases that can be prevented by vaccine. Children in Britain are vaccinated several times before starting school. But, scientists at Oxford University have discovered that these vaccines might not be doing enough. When examining children seeing their GP about a persistent cough, one in five of them actually had a case of whooping cough, including children who had been vaccinated against it. Kay Wang, who lead the study, told Chris Smith more...

You've probably heard the idea that stress gives you a heart attack, and we certainly know that it is a risk factor, along with things like high blood pressure, high cholesterol, obesity and smoking. But exactly how stress affects the body to increase the chances of having a heart attack is a bit of a mystery. Now a team of US and German scientists think they might have figured it out. It turns out that stress increases the number of immune cells, known as white blood cells, in atherosclerotic plaques - the fatty blobs that clog up your veins and give you a dicky ticker. Lead researcher Matthias Nahrendorf spoke to Kat Arney from Harvard Medical School to explain more about the link.

Using a cheap chemical used normally to make tofu stick together, scientists at the University of Liverpool have stumbled upon a much more environmentally-friendly and cheaper way to manufacture very light-weight solar panels called thin film photovoltaics. Science writer Mark Peplow explains the significance of the find to Chris Smith...

As of midnight on Tuesday, the herb "qat" became a Class C drug. Users chew the leaves of this east African flowering plant to achieve a buzz which, some say, is similar to caffeine. The ban is surprising because the UK's Advisory Council on the Misuse of Drugs have argued that there isn't sufficient evidence that qat causes health problems to justify a ban. David Nutt is professor of neuropharmocology at Imperial College London and spoke to Chris Smith about the stimulant.

It's not just conversations that we share with our mobiles, but also our bacterial blueprints! According to Oregon scientist James Meadow, every time you interact with your phone you deposit a bug fingerprint unique to you. And this means that our mobiles could actually be used to track how we pick up and exchange microbes with the world around us and even screen doctors and nurses to see who might be carrying potentially harmful bugs. Chris Smith spoke to James Meadow to find out more.

Salamanders can grow back entire limbs if they lose them. A team at University College London lead by Dr Max Yun are looking at the genetic pathways that enable these amphibians to regenerate their arms and legs. This could help us understand how human healing can be improved, as Victoria Gill explains to Chris Smith...

The latest digital imaging techniques are literally throwing new light on the ingenious variety of materials that have been used over the centuries to create artists' paint pigments. A new exhibition at the National Gallery in London is looking at the history of colour making over time. Jane Reck has been finding out how preparations were given a helping hand with a state-of the art positioning easel that provides the ability to examine great works of art in unprecedented detail.

Six months after some of the worst flooding witnessed in Britain, Professor David Dermeritt from Kings College London explains to Graihagh Jackson how these deluges have changed Britain's policies on how we manage rivers, risks and rising water levels. What is the future of flooding? Will climate change worsen it? And how will the government protect property?

This week, 3000 metres up a Chilean mountain, scientists pressed the button to blow up half a million tonnes of rock. The mountain's called Cerro Armazones and the reason it was being blown up was to create the site for what will become the world's biggest most powerful optical telescope. With typical scientific understatement its known as the European Extremely Large Telescope or EELT. Isobel Hook an astrophysicist from Oxford University told Chris more about the project.

Bacteria that can degrade the woody material in plant waste and turn it into an oil-free material for plastics manufacture have been developed by scientists at Warwick University in Britain. Professor Tim Bugg told Chris more...

In this episode of the eLife podcast, the neuroscience of chewing, African sleeping sickness, skin cancer, and an ancient protein complex called TSET. eLife editor-in-chief Randy Schekman also shares his thoughts on scientific publishing...

There's a new theory this week claiming that men's faces evolved to take punches. It comes from researchers at the University of Utah and goes against a previous theory that craniofacial evolution was driven by a diet of nuts, seeds and vegetables. The Utah team think that extra-thick bones and muscles in the jaw and brow helped to protect our ancestor's faces when they got into punch ups, presumably while fighting over women. But although it's a neat story, and a different way of looking at the evolution of skulls, there are some problems with the idea, as Kat Arney found out from Julie Lawrence from the Leverhulme Centre for Human Evolutionary Studies in Cambridge, who's also working on our ancestor's skulls...

Has the likelihood of alien life existing just become a lot more likely? Astronomers at the Harvard-Smithsonian Centre for Astrophysics announced this week that they have found what's being dubbed the "Godzilla of Earths" - it's a rocky planet orbiting a distant star over 500 light years away. But it's over twice the diameter and 17 times the mass of the Earth. So it's exciting for two reasons - first, space scientists had thought that planets could only be that big if they were made of gas, like Neptune or Jupiter, rather than rock, like Earth; and, second, the star this planet is orbiting is over 10 billion years old, proving that rocky planets, that could harbour life, have been around for much longer than we have. To find out more about the implications, Chris Smith went to see Cambridge University's own alien planet hunter, Madhu Madhusudhan

Gannets are using fishing boats as fast-food outlets, chasing them for miles over the ocean. Thomas Bodey explains to Chris Smith how GPS tracking on both the birds and ships shows that the gannets can tell trawlers from yachts. But there might be a downside to this kind of convenience cuisine.