One of Silicon Valley’s most infamous entrepreneurs, Elizabeth Holmes, is scheduled to stand trial on Aug. 31 to defend accusations that she used her biotech startup, Theranos, to commit criminal fraud. Holmes, 37, once proclaimed the youngest female self-made billionaire — and featured in Yahoo Finance’s new documentary "Valley of Hype," streaming on Yahoo Finance starting Aug. 30 — faces federal charges of wire fraud and conspiracy to commit wire fraud tied to the collapse of the blood-testing company.