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Lead balloon The US is facing a “helium crunch”, and it’s bad news for cryogenics researchers, the aerospace industry and electronics manufacturers, says a National Research Council report. The reason? The US government’s ill-advised decision to sell off its helium reserves a decade ago. The panel worries that the US will become a net helium importer in 10 to 15 years. Rotavirus vaccine An oral vaccine against a major cause of diarrhoea, rotavirus, which kills 500,000 children each year, is to be introduced in 44 poor countries by 2015,
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