12513. "WHAT'S THE WINDOW FOR MAKING BABIES?" BY RITA RUBIN. Analysis of 1996 article from U.S. News On-Line by Rita Rubin on the determination of when women are most fertile. The discovery of more precise information is called a "break-through," and the implications for natural family planning and the use of home test kits are discussed. 5 pages, 9 footnotes, 3 bibliographic sources.