What would I build with a human body data stream API? A real-time fertility / menstrual cycle monitor. Basal body temperature + hormone spikes monitored remot

What would I build with a human body data stream API? A real-time fertility / menstrual cycle monitor. Basal body temperature + hormone spikes monitored remotely, hooked up to some kind of a real-world notification system (push message to your phone? arduino-powered lights and klaxon? you choose!) that goes off when you're within 24 hours of ovulating. Depending on whether or not you're intending to get pregnant that month, this would either be your alert system to get busy or alternately your alert system not to get busy. Add in a separate notification system 48 hours before the crimson tide is due to start, and maybe hook it up to another API that auto-purchases and delivers chocolate to your house -- or work a purchasing deal with one of the many "period box" delivery companies that have sprung up lately (see http://pregnancy.about.com/od/Menstrual-Cycle/tp/Box-Subscriptions-For-Your-Period.htm http://pregnancy.about.com/od/Menstrual-Cycle/tp/Box-Subscri...). Of course, this API would only be usable for 50% of the population at best, and likely only for ages 12-45 within that 50%, but that's still a pretty big potential market. :-)