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In a quest to make concrete more durable and sustainable, an international team of geologists and engineers has found inspiration in the ancient Romans, whose massive concrete structures have withstood the elements for more than 2,000 years.Sample of ancient Roman maritime concrete from Pozzuoli Bay near Naples, Italy. Its diameter is 9 centimeters, and it is composed of mortar formulated from lime, volcanic ash and chunks of volcanic tuff. (Carol Hagen photo) Using the Advanced Light Source at Lawrence Berkeley National Laboratory (Berkeley Lab), a research team from the University of California, Berkeley, examined the fine-scale structure of Roman concrete....

“CLEAT lawyers and staffers were on the scene shortly after reports of the shooting surfaced,” the web story explained. “Organizer Tracy Chance was allowed access to officers at fixed positions to make sure they had access to water and sports drinks to keep them hydrated. Tracy was able to get the photos posted here.”

A landmark U.S. study that examines the "potentially enormous" global storehouse of methane hydrate -- an icebound form of natural gas found largely in Arctic perma frost and seabed deposits -- has highlighted a Canadian site as one of the world's most important sources of the powerful but elusive fuel. The report, released this week by the U.S. National Research Council, summarizes the promising research conducted over the past three years at the Mallik methane hydrate site in the Mackenzie Delta near Inuvik, N.W.T., about 1,200 kilometres north of Whitehorse. While the full results of the experimental tapping of the...