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250 million years ago, toxic coal ash caused a mass extinction

One of the biggest episodes of mass extinction may have been caused 250 million years ago because of toxic ash resulting from burning coal. In the current Nature Geoscience, a team led by Stephen Grasby of the Geological Survey of Canada—Calgary, report evidence the eruption of the Siberian volcanoes torched massive

US President Obama to Trace Family History in Germany

US President Barack Obama is traveling to Germany in June on a personal trip to Dresden and the Buchenwald concentration camp in search of his family history. Obama's great-uncle, Charlie Payne, served in the 89th Infantry Division during World War II and participated in the liberation of Ohrdruf, a forced labor

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