Bloody Amazing

Elizabeth Holmes, 30, is the youngest woman to become a self-made billionaire–and she’s done so four times over. In 2003, as a Stanford undergrad, she founded Theranos, a Palo Alto company that’s disrupting the business of blood testing, replacing the services provided by giants like Laboratory Corp. of America and . “What we’re about is the belief that access to affordable and real-time health information is a basic human right, and it’s a civil right,” she says .