Disease-defying spuds exiled from Europe – again
A new strain of potatoes has been genetically modified to resist blight, but widespread opposition to such crops mean it is unlikely to help European farmers
Arctic thaw significantly worsens global warming risk
As Arctic sea ice retreats, the Earth's ability to soak up the sun's heat is boosted by twice as much as we thought, compounding the greenhouse effect
Fitbit for the mind: Eye-tracker watches your reading
Devices able to log everything you read will soon go mainstream, letting you see for yourself whether your reading habits need revamping
First animals may have lived with almost no oxygen
Simple sponges can live with 200 times less oxygen than present atmospheric levels, supporting the idea that animals evolved before oxygen-rich oceans
Spit test could allow depression screening at school
Boys with high levels of cortisol and depressive symptoms have a high risk of developing depression. This could be prevented if they can be identified
Great Lakes deep freeze opens path to cathedrals of ice
Step inside a cave of ice that hasn't been accessible since 2009 – now open to visitors brave enough to trek across the frozen surface of Lake Superior
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