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I’ve written before about the many ways that bacteria can move around. Considering that they’re just one cell long, micro-organisms have a whole range of ways to travel through their little world. Movement is useful for finding food and for changing your environment when all nearby resources have been exhausted

Deep in South Africa's gold mines water can be found in rock fractures, hosting bacteria that off the stone itself and form biofilms on the hard surfaces. Now new samples pulled from these sunless pools show that nematodes--roundworms of varying size that are essentially tubes with a digestive tract and thrive everywhere on the planet--likely graze on these bacterial films, surviving more than a kilometer underground.