More than two months into Minnesota's tobacco trial, the defense has called its first witness - University of Minnesota history professor Hy Berman. The state and Blue Cross Blue Shield of Minnesota rested their case against tobacco companies yesterday, but could call more witnesses later in the trial. Minnesota Public Radio's Laura McCallum reports... Tobacco companies could not have begun their case with a more likable witness - even the state's lead attorney called Hy Berman a "nice fellow". The jovial, round-faced professor may have charmed jurors by offering to invite them to his home to show them his research - he said his wife would even make c