Researchers develop inkjet-based circuits at fraction of time and cost
Apple Store's malware problem exposed by researchers
Bacteria found thriving in troposphere
Clays – signs of water – are 'widespread' on Mars
Hopping robots could consume less energy
Swarms of micro-robots could one day carry cargo
Team gives ancient life another chance to evolve
One in seven work emails 'just gossip'
New technology to detect radioactive materials
How celebrities spread Twitter's biggest-ever story
New process promises cheap, flexible electronics
Volcanic activity detected on Greek island
Loss of Arctic ice causes snowy northern winters
Eyes-free texting could aid visially impaired
Quarter of tweets 'not worth reading'