It arrives, like clockwork, every month (unless there are there are special circumstances): It's your period.
Women are all too familiar with this not-so-glamorous cycle of nature, but the truth is if you look at the science it's a pretty incredible thing.
And for those of you who haven't thought about this cycle since a high school health class, here's a probably much needed refresher, courtesy of AsapSCIENCE:
Hopefully the wider population -- including Apple, who didn't include a period tracker with new iPhone 6's Health Kit -- will take note.
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