AT THE MOVIES, Mariel Hemingway portrays a track star who has a lesbian relationship in Personal Best. The movie stumbles at the box office ($6.6 million domestic gross), sending mainstream Hollywood running from gay subject matter for a few years. IN MUSIC, America goes for Daryl Hall and John Oates' ''I Can't Go for That (No Can Do),'' propelling it to the top of the singles chart. Meanwhile, Olivia Newton-John's suggestive workout anthem ''Physical'' bounces down to No. 4. IN BOOKSTORES, A Few Minutes With Andy Rooney, a series of ostensibly humorous essays by the 60 Minutes codger, grabs the No. 1 non-fiction spot. AND IN THE NEWS, 170 protesters are arrested during an anti-nuclear weapons demonstration in Livermore, Calif. Sample sign: ''You can't hug your children with nuclear arms.''


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