Hmmm, it seems pretty similar to one from a while back http://news.ycombinator.com/item?id=1390147 http://news.ycombinator.com/item?id=1390147. Maybe this is an

Hmmm, it seems pretty similar to one from a while back http://news.ycombinator.com/item?id=1390147 http://news.ycombinator.com/item?id=1390147. Maybe this is an April Fool's joke though. Anyways I can always tell when my girlfriend's period starts, but I think her mood change is partly a psychological reaction to the physical symptoms rather than just a "hormonal rollercoaster" as they're claiming.