Many people's migraines are correlated to changes in barometric pressure. What's really cool is with thousand (or millions!) of people tracking when they have a

Many people's migraines are correlated to changes in barometric pressure. What's really cool is with thousand (or millions!) of people tracking when they have a migraine while using a barametric pressure tracking device, we'll finally get solid data to see how strong this correlation is and whether it involves other factors. Medical science can't, for obvious reasons, do a lot of controlled experiments with people. The next best thing is using "big data" collection over millions of people over many dimensions. Knowledge will benefit immeasurable.