AT THE MOVIES, audiences ogle the buxom twosome of Marilyn Monroe and Jane Russell in Gentlemen Prefer Blondes (left). ON TV, faster than a speeding bullet, Man of Steel George Reeves soars in the half-hour Superman serial. IN BOOKSTORES, Norman Vincent Peale’s landmark self-help guide, The Power of Positive Thinking, continues its run at No. 1 on the New York Times best-seller list. AND IN THE NEWS, Communist forces turn over 400 United Nations captives in the first prisoner exchange since the July 27 armistice that ended the Korean War.