Anonymous 49'er writes "Nature is reporting that bacteria found in Australian gold mines are capable of extruding tiny invisible 'secondary grains' from soil and alluvial systems. From the article: "Potential applications -- from sensing the bacteria as a way to look for gold mines, to using them to help make industrially useful particles of gold -- may be some way off. But Southam is keen to exploit the bacteria's natural trick. 'I want to make a gold nugget one day,' he says. 'Gold nuggets grow in nature, so why shouldn't I be able to make one?'"