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The aims of in-service training , which is mainly purchased by companies and public sector organisations , relate to business economics and productivity . Many a man who started with you the noble fight weary with years and burdened down with care have long gone . " So , it 's remarkable that we can use Chandra to dig into the past and see this monster black hole 's capacity for destruction . As mission managers reported Sunday , no impacts occurred during the first 135 seconds of flight , the period when atmospheric density is high enough to give debris enough energy to cause heat shield damage . The refuge has undertaken comprehensive conservation planning , which will conserve , protect and restore habitat for 29 species of waterfowl , 65 kinds of fish and 300 species of migratory birds on more than 5,000 acres along the lower Detroit River in Michigan and Canada .