Antarctica

Discovery News let us know about a story in the new Science about a spectacular find below the Antarctic glaciers:

It's a particularly tough environment, with no light, no oxygen, and extremely cold temperatures. But the microbes appear to live -- and thrive -- off a combination of iron and sulfur, according to a new study. The result of that strange metabolism is a brilliant red streak of cascading ice called Blood Falls.
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The chemical analyses showed that the microbes breathe in a form of iron that leaches into the water from the bedrock below. Then, with the help of sulfur compounds as catalysts, the microorganisms breathe out a different form of iron, which gives Blood Falls its rusty color.