This Saturday, thousands of runners will gather in Howard County to run the Maryland Half Marathon, to raise money for the University of Maryland's Marlene and Stewart Greenebaum Cancer Center. Traditionally, one of the most essential pieces of equipment that runners wear is a watch. Race officials will have the elapsed time of the race posted throughout the course, but most runners will be closely monitoring their individual times, making sure they aren’t going too fast or too slow to reach their finishing time goal. We are in the Age of Self Quantification: the Fit Bit, the Misfit, the Nike Plus, and a host of other wearable tech devices track everything from how many steps you take in a day to how much REM sleep you’re getting. Host Tom Hall talks with Maryland Morning contributor Monica Reinagel, the Nutrition Diva, about what collecting all this data might mean for the future of research into how we can improve our health.