Russian researchers at the Vostok station in Antarctica pose for a picture Feb. 5, 2012, after reaching subglacial lake Vostok, a major scientific discovery that could provide clues for search for life on other planets. Scientists hold a sign reading "05.02.12, Vostok station, boreshaft 5gr, lake at depth 3769.3 metres." (Associated Press/Arctic and Antarctic Research Institute Press Service)
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