Darwinian cattiness

…when women are at the most fertile point in their monthly cycle they tend to have a lower opinion of other women’s looks. And that’s not just because of mood swings. Menstrual phase had no effect on how the same women rated the looks of men, reports Maryanne Fisher of York University in Toronto, Canada.

Here is one version of the story. Here is another. Here is the home page of the researcher.

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