What does the world's most energy-thirsty nation want? More oil. But the last of the planet's untapped fossil fuel lingers in some very remote and treacherous places. Whether in the Rub'al Khali desert, the Congo Basin, or the frozen Northwest Territories, frontier exploration is fraught with physical and political peril. In some cases, the best way to begin looking is with a light and fast team and the sort of hydrocarbon-sensing tools that can be...
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