From The Economist:
MORE than a billion people lack clean water—and in most cases the lack is just of cleanliness, rather than of the water itself. The result is disease, particularly diarrhoea. This kills millions of children a year and stunts the growth of millions more. Better water filters, then, could save many lives and improve many others, and Yi Cui of Stanford University thinks he has come up with one........The filter element he and his team have designed is a mesh of tiny carbon cylinders, known as nanotubes, and silver wires laid on top of a thin strip of cotton cloth. Silver is well known to kill bacteria, so Dr Cui conjectured that forcing bugs to pass close to the metal without actually trapping them might lead to their destruction......read in full
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