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Identifying what causes usually harmless and solitary desert locusts to gather together in massive and destructive swarms.
The genome of sorghum, the world's fifth most-grown cereal, has been sequenced and genes that confer drought resistance identified. What have we learnt about pheremones in the 50 years since their discovery? The new medical imaging machine that allows doctors to view the working, breathing lung in new detail.
"My administration will not deny facts, we will be guided by them" – US President Obama's speech on science and climate change.