Menstruation affects half of the world’s population during their lives. But it’s little understood. Here are five surprising thing you may not know about periods.<br /><br />Subscribe to BBC Ideas https://bbc.in/2F6ipav<br /><br />Made by Angel Sharp Media in partnership with @oxforduniversity. <br /><br />____________________________<br /><br />Do you have a curious mind? You’re in the right place.<br /><br />Our aim on BBC Ideas is to feed your curiosity, to open your mind to new perspectives, and to leave you that little bit smarter. <br /><br />So dive in. Let us know what you think. And make sure to subscribe! https://bbc.in/2F6ipav<br /> <br />Visit our website to see all of our videos: https://www.bbc.com/ideas<br />And follow BBC Ideas on Twitter: <br /><br /> / bbcideas
