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The Mongol hordes led by Genghis Khan carved out the largest contiguous land empire history has ever witnessed, reaching at its apex from Asia's Pacific coast to eastern Europe and down into Persia and southeastern Asia. Although conventional wisdom suggests drought may have pushed them across the steppe to conquer more bountiful lands, ancient, long-dead trees discovered in a forbidding lava field in Mongolia give evidence that unprecedented rains might actually have helped fuel their expansion. [More]

LinkedIn's new "Volunteer Experience and Causes" feature, launching today, encourages users to tout their selfless deeds to land better jobs.

Coal may be the most loathed energy source among sustainability advocates, but it isn't going anywhere, especially now that governments are investing billions in carbon capture and sequestration projects for coal plants. Any country with significant coal reserves and a government that pays little attention to safety and environmental hazards stands to profit handsomely.