Deena in the News Why do only some animals have periods? Read the article A Fundamental Stage of Human Reproduction Is Shifting Read the article Ovaries are an enigma that could unlock human lifespan Read the article The Top 50 Science Books of 2023 Read the article 5 Quirky Histories We Can’t Stop Thinking About Read the article On the Origin of Ovaries Read the article The best books that capture the magnificence and mystery of female biology Read the article Watching my grandmother age makes it clear: We don’t invest enough in women’s health Read the article What if we could get rid of menopause? Read the article Next Big Idea Club’s August Must-Read Books Read the article The future of fertility Read the article Reproductive choice is at the core of being a female mammal Read the article Females of every species exercise reproductive choice Listen to the interview What is the point of menstruation? Listen to the podcast Women’s menstrual cycles tied to moon’s phases Read the article Three surprising questions about periods Watch the video Why do women have periods when most animals don’t? Read the article Explainer: why do women menstruate? Read the article “Periods may have evolved as part of a process to discard unhealthy embryos during early pregnancy.”