But Pennsylvania is one of those many states that says nothing against the practice, which in the absence of a federal prohibition, makes it perfectly OK. In fact, those were usually among the first questions asked, [Kiki Peppard, a single mother,] said, and many hiring managers ended the encounter soon after she honestly answered them.I'm curious about the extent to which this particular brand of discrimination against mothers plays a role in the "gender wage gap" that's making the news of late. Presumably it's a big one. Last year, Shelley Correll and Stephen Benard, two Cornell researchers, conducted a little experiment, creating resumes and sending them out to a variety of employers. The results: "Mothers were ranked as less competent and committed and least likely to be promoted. And they were offered lower starting salaries." On the other hand, fathers were "most likely to be promoted," even more than childless dudes.