Deena in the News

Why do only some animals have periods?

A Fundamental Stage of Human Reproduction Is Shifting

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The Top 50 Science Books of 2023

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On the Origin of Ovaries

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Females of every species exercise reproductive choice

What is the point of menstruation?

Women’s menstrual cycles tied to moon’s phases

Three surprising questions about periods

Why do women have periods when most animals don’t?

Explainer: why do women menstruate?

“Periods may have evolved as part of a process to discard unhealthy embryos during early pregnancy.”