Menstruation/menarche refers to vaginal bleeding that occurs at the end of a menstrual cycle. The endometrial lining builds up throughout the course of every menstrual cycle and is shed at the end, when pregnancy fails to occur. In case you wonder why menstrual cycles are also called periods, they are called so to mean an "interval of time" or a "repeated cycle of events", and this since 1822. Here are 15 surprising facts you may not have known about menstruation. 1. There are more than 5,000 euphemisms for menstruation around the world. These are the most frequently used euphemisms for menstruation in English: Aunt Flo/Aunt Flow/Aunt, Time of the month/TOM/That time of the month, on the rags/rag/ragging, red tide/river, code red, monthly visitor, mother nature, lady friend, bloody Mary, shark week. The French say "Les Anglais ont debarqué", which translates to "The English have landed". 2. Menstrual taboo can still be observed in
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