Image: Curiosity's arm over 'Marimba' target on mount sharp

NASA's Curiosity Mars rover began close-up investigation of a target called "Marimba," on lower Mount Sharp, during the week preceding the fourth anniversary of the mission's dramatic sky-crane landing.

Oklahoma geology group links earthquakes to oil waste wells

The Oklahoma Geological Survey said Tuesday it is "very likely" that most of the state's recent earthquakes were triggered by the subsurface injection of wastewater from oil and natural gas drilling operations.

Greenpeace 'polar bears' protest Arctic oil drilling

Two Greenpeace activists dressed as polar bears boarded an oil platform in Norway on Wednesday to protest against Norwegian oil and gas group Statoil's planned drilling in the Arctic.

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