Ever since an accident that killed his eight-year-old brother, Mike Capoferri has been interested in time travel, and now he thinks one of the alien artifacts found on the moon is a time machine.
Mike was a recent but ardent science-fiction fan. “I want to change it, Dr. Stuart,” he said earnestly. “I want to go back to four weeks ago and take away Tony’s Flexy.” He meant it, of course.

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  1. “Wrong-Way Street” by Larry Niven, in Galaxy, April 1965.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Larry Niven