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Periods are a fact of life for roughly half the population, yet discussions of the menstrual cycle are often shrouded in confusion and embarrassment. Part of the Q&A, Health Guides series, this book offers a broad introduction to the menstrual cycle-what it is, why it exists and how it changes over time, what's normal, when you may want to see a doctor, and which products, medications, and activities can make "that time of the month" a more p...