Starting a business felt like a calling to New York native Jared Rosenthal. So in 2010, he used his experience in health-care administration and mobile marketing to start Health Street, a company that provides DNA testing, alcohol testing, and background check services, not just on-site, but also from a traveling recreational vehicle that asks the profound question, “Who’s Your Daddy?” in boldly written text across its side. Health Street started in an RV originally because Rosenthal could not afford to lease an office, but now, he says, the curious truck helps bring in people to get tested on a whim.