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The U.S. Embassy in Addis Ababa has issued a heightened security alert a day after Ethiopia's government warned of an imminent terrorist attack. VOA's Peter Heinlein in the Ethiopian capital reports the alert coincides with a government roundup of e
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By Alisha Ryu Nairobi 15 August 2007 Police in Ethiopia say they have prevented a rebel group called the Oromo Liberation Front from carrying out a plan to bomb public buildings and assassinate officials in the Ethiopian city of Nazareth. VOA Corresp
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Cement is a major component of concrete, the world's most widely used man-made material, an integral part of roads, bridges and buildings. But making cement requires heating limestone and other materials to very high temperatures, a process that rele
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