One-Minute Physics: How do we know our world is 3D?
Watch an animation that shows how to test that we live in three dimensions
Ars Electronica celebrates subversion
From an artist who injected horse plasma to hacking the news, this year's Ars Electronica festival is all about questioning - and breaking - social boundaries
WikiLeaks encryption row puts informants at risk
A password published in a book is at the centre of a row that has led to US diplomatic informants' names being published online
Gene therapy could reduce radiation sickness
Radiation therapy is more effective in some people with cancer than others. A new study reveals why - and suggests how to make the therapy more effective
Single molecule is tiniest electric motor ever
Besides vying to smash a world record, the teeny motor could help push fluid through narrow pipes in nanodevices
Particle quest: Hunting for Italian WIMPs underground
At the forefront of the hunt for elusive particles is the Gran Sasso National Laboratory, the largest underground facility of its kind
Deus Ex: A world of augmented humans
The beautifully designed new video game Deus Ex: Human revolution raises questions about augmented humanity in the future. But is it any fun to play?
Stem cells may save rhinos from extinction
Rhino skin cells have been turned into stem cells that can become any cell in the body - including sperm and eggs
Svante P??bo: The man rewriting human evolution
He sequenced the Neanderthal genome and then discovered a whole new type of human. What's next?
Quantum minds: Why we think like quarks
The fuzziness and weird logic of the way particles behave applies surprisingly well to how humans think
African ancestry boosts peanut allergy risk
People with African roots may be genetically susceptible to peanut allergies, but where milk sensitivity is concerned, culture may matter more
Automated marking takes teachers out of the loop
Software can now mark essays, but will it make students write like robots and can we really trust its judgement?
Beware the lone wolf radicals
Home-grown killers such as Anders Breivik have a distinct psychology that should make it easier for police to spot them before they strike, says Kathleen Puckett
Instant Expert: AIDS - What works?
We must factor in politics, economics and people's behaviour as well as medicine in the fight against HIV, says epidemiologist Elizabeth Pisani
Clinicians no longer in favour at the Nobel Institute
Some 70 years ago, clinicians were picking up almost 80 per cent of Nobel prizes in physiology and medicine - but most of the prizes now go to their colleagues in the lab
Instant Expert: Defeating HIV
While there are good treatments for HIV, we have failed to devise effective ways of stopping new infections
Probe spots remains of Martian lake and river
Winding channels and sediment deposited in the shape of a fan speak of an ancient river that flowed into a lake on Mars
Test shows most efficient way to board a plane
A method developed in a 2008 computer simulation has now been tested with real people
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