Elizabeth Holmes had the world on a string. In 2003, the 19-year-old college dropout founded Theranos, a medical technology company that promised to revolutionize health care with a device that could test for a range of conditions using just a few drops of blood from a finger prick. Holmes, a striking blonde with a bold presence, racked up big-name investors, forged a partnership with Walgreens and raked in the money: Theranos reached a valuation of billion. But this story of a Silicon Valley unicorn was too good to be true. An investigation by Wall Street Journal reporter John Carr eyrou uncovered the truth that led to the company’s downfall. Holmes and former Theranos president Ramesh “Sunny” Balwani have been indicted on federal fraud charges. Carreyrou has chronicled the saga in a book titled, Bad Blood: Secrets and Lies in a Silicon Valley Startup . He visited the Knowledge at Wharton radio show, which airs on Wharton Business Radio on SiriusXM , to talk about the story.…