We like when data has an immediate benefit. And that's why we like Sickweather - the "world's first Doppler radar for sickness." It delivers alerts for flu, norovirus, pink eye, whooping cough, and 19 other illnesses and real-time warnings whenever you enter a "sick zone." But that's just one part of why this thing is so great. It's packed with interesting data analysis and tech wizardry.

So, where's the data come from? According to the developers Sickweather uses a patent-pending process to track and map reports of illness that they scrape from social media,  in addition to crowdsourcing directly from the user community.

And, naturally, there's a version for Apple Watch,

SickScore(TM) for Apple Watch adds an entirely new dimension to Sickweather’s service, and works by analyzing nearby contagious illnesses found in over 2 million reports gathered and processed each month from combined sources including: social media, the Sickweather community, and Sickweather partner apps. An algorithm then measures the nearby illnesses by their relative reproductive score along with other demographic factors, such as population density. Unique to our Apple Watch app is a Handwashing Timer that runs for 20 seconds (as recommended by public health organizations) and uses Apple's Taptic Engine to let you know when you are done."

Check it out for yourself - Sickweather - community illness tracker, real-time sickness map & health alerts on the App Store on iTunes.