In perhaps the greatest fraud in the history of the Silicon Valley tech boom, Norah O'Donnell investigates the failed biotech company, Theranos, for Sunday's "60 Minutes." Stanford University dropout Elizabeth Holmes created the innovative blood testing company and was named the youngest self-made female billionaire in the world. But it all came crashing down after an employee at Theranos blew the whistle. Watch O'Donnell's report this Sunday, May 20 on "60 Minutes."

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