The healthcare system in the U.S. is a slow-moving, slow-changing beast, but it’s also riddled with inefficient parts that beg for data-driven reinvention. That’s created huge opportunities for startups — and some of them are already seeing the payoff. The Affordable Care Act and accompanying legislation like the HITECH Act have lit a fire under the movement to rethink they way we deliver and pay for healthcare. Accordingly, investment in the digital health space has accelerated in 2014; at the end of June it totaled $2.2 billion, already exceeding 2013’s total funding just halfway through the year.