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Live to eat or eat to live? A balanced but restricted diet causes rats to live longer – but does that work for us humans? As the search continues for a malaria vaccine, Dr Sunetra Gupta of Oxford University explains that a form of immunity has been observed in people who have been bitten at a young age. The polar ice sheet over Greenland discovered to be shrinking around the edges by Nasa flights. How Cuba's biotechnology industry was a personal project for president Fidel Castro.