Legal Victory Takes Toll On Journal MIT's Magnet Lab Keeps Trying Back In The Classroom A Stand Against Too Many Authors Minority Schools Get Help For AIDS Trials Despite a New York state court ruling last month that scientific journals enjoy special immunity against libel suits based on the expression of an opinion, the editor who was the defendant in the case (The Scientist, Oct. 1, 1990, page 1) believes that he's won a Pyrrhic victory. "The circulation has dropped by a third," says