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Happiness spreads like the plagueIt seems happiness – and misery too – spread through social networks, affecting people through three degrees of separation
Over-budget Mars rover mission delayed until 2011Technical problems are forcing NASA to delay the launch of its Mars Science Laboratory by two years, at a cost of $400 million
Complex dance of embryo cells filmed in new detailA new microscopy technique produces stunning movies of fly embryos developing, and enables a medical breakthrough
'Rhythms' in Martian rocks mark out past climate swingsGiant stairsteps on Mars are evidence of ancient climate cycles, suggest images from NASA's Mars Reconnaissance Orbiter
Spanish Inquisition left genetic legacy in IberiaModern inhabitants of Spain and Portugal still display genetic traces of the cultural melting pot that existed in the late 1400s
Cleaner air to turn iconic buildings greenThe days of smutty grey and black buildings are gone, suggests research into how stone facades will be altered by changes in the atmosphere
Large Hadron Collider gears up for July restartThe huge particle smasher will be back up and running by the third quarter of 2009 – probably
Happiness spreads though society like the fluIt seems happiness – and misery too – spread through social networks, affecting people through three degrees of separation
Tiny 'paddleboat' could ship drugs around the bodyThe device is the first artificial microswimmer to move without using chemical propulsion or bending itself into different shapes
Universe's dark matter mix is 'just right' for lifeIf the total abundance of dark matter in the universe was any different, humans and all other life on Earth might not exist
Rich countries carry out '21st century land grab'As the world reels from the recent food and fuel crises, rich countries are snapping up vast tracts of land in poor regions to grow food and biofuels for themselves
Are climate scientists overselling their models?As the UN climate negotiations get underway in Poland this week, physicist tells that, while man-made climate change is real, climate modellers are too certain of their results
Light 'echoes' solve mystery of famous supernovaThe exploding star that Tycho Brahe saw in 1572 was a gluttonous white dwarf, ghostly light from the centuries-old event reveals
First superconducting transistor promises PC revolutionThe breakthrough promises to put today's gigahertz processors in the shade – if practical hurdles can be overcome
First 'placebo gene' discoveredFor the first time, a gene is being linked to increased susceptibility to the placebo effect – the mysterious capacity some people have to benefit from sham treatments
The secret signals in human sweatDo our brains respond to hidden messages in pheromones after all? investigates
The secret sex signals in human sweatDo our brains respond to hidden messages in pheromones after all? investigates
Megathrust earthquake could hit Asia 'at any time'A new reconstruction of two 2007 earthquakes off Sumatra shows that there is still plenty of pent-up energy waiting to be released
Invention: Flawless wing mirrorsWide-angle mirrors without potentially dangerous distortion are possible, says a new patent application
Eco-problems of the 80s return to haunt usClimate change is exacerbating damage from acid rain and other forms of environmental degradation – such effects could have greater impact than global warming itself
Environmental problems of the 80s return to haunt usClimate change is exacerbating acid rain and other forms of environmental degradation, and could have greater impact than global warming itself, say researchers
Gallery: The lives and deaths of starsSee images of stars forming, both in our Milky Way Galaxy and in extreme environments in other distant galaxies
Gallery: The life and death of starsSee images of stars forming, both in our Milky Way Galaxy and in extreme environments in other distant galaxies
US mulls free wireless internet for allFree web access could bring the benefits of the internet to groups currently left behind by the broadband age – but is the plan about to be scuppered?
Web test could help beat the bluesFeeling glum? New software could predict whether your feelings will descend into full-blown depression within the next year – : take the test