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Residents in Stockholm are divided over reports that rabbits are being used to make biofuel.


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Nuclear decay-driven machines could gather gases from the atmosphere of Mars, giving future robotic missions leaps of a kilometre, researchers say. A design concept in Proceedings of the Royal Society A outlines an approach to compress CO2 and liquefy it. The liquid would then be heated much as in a standard rocket, expanding violently into a gas to propel exploratory craft great distances.


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Iran has cut energy and food subsidies, risking a repeat of angry protests which followed fuel rationing in 2007.


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Fuel cells need a catalyst to speed up the chemical reactions that change hydrogen into water and electricity. Platinum is very good at this but it is famously expensive and rare. Some microbes, though, have known for a billion years how to make enzymes that can do the job using cheap and abundant nickel and iron. These natural enzymes are unfortunately difficult to obtain and do not do so well outside the microbe. Now researchers have...


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