Havi Nguyen sees her company as the solution to a supply problem for a market with staggering demand. She thinks Abby Care can do with in-home health care what Uber did for taxis and Airbnb did for hotels. Read the full story: https://t.co/RmXqGo8Oyh #BillionDollarStartups https://t.co/waBWc9cnq5 ...