A 7.8 magnitude earthquake—described as the strongest to hit Iran in more than 50 years—struck the country near the border with Pakistan, killing hundreds of people, officials fear.
The number of significant earthquakes in the Midwest has increased almost fivefold in the last four years. Researchers with the United States Geological Survey set out to discover why.
The world still harbors large reserves of petroleum, but they are of the hard-to-reach, hard-to-refine, “tough oil” variety that will be more costly to extract, refine and buy at the pump.