When Elizabeth Holmes founded Theranos, the blood testing start-up, she was held up as one of the next great tech innovators. But her company collapsed, and she was accused of lying about how well Theranos’s technology worked. Now she is on trial on fraud charges. The case against Ms. Holmes is being held up as a referendum on the “fake it till you make it” culture of Silicon Valley, but it’s also about so much more. Guest: Erin Griffith, a reporter covering technology start-ups and venture capital for The New York Times.