Authorities say a controlled explosion Wednesday eliminates the danger from chemicals they found in the Beaver Dam apartment complex where a man died.  Dozens of residents who were evacuated have been allowed to return home.  The chemicals in the apartment were so unstable the body of the victim wasn’t removed until Tuesday.  He had been killed in a blast reported Monday afternoon.  Police say the body hasn’t been identified.  Beaver Dam Police say it could take weeks — or even months — to complete the investigation of what was going on in that apartment.