what happened behind those closed doors has led to a lot of introspection here in silicon valley. but there's still a culture of faking it till you make it here, and until that changes, people worry that what happened in theranos could happen again. james clayton, bbc news. tyler shultz was the first theranos employee to blow the whistle, and it was at great personal cost given his own grandfather, former secretary of state george shultz, was on the company's board. here he is explaining why he decided to speak out to our sister network cbs. it was really, really tough to keep going, but i am just extremely stubborn and i knew i was right and i was not going to lay down and say that i was wrong when i knew with 100% certainty that i was right. why do you think they believed her over you, someone who was on—site there at the company and could see what was going on?