[applause] >> The dean at a business school where I taught had given me a nickname. He called me Mr. . Confidence.He had heard students rave about my public speaking classes saying that they were life-changing and transformative and memorable. And life-changing and transformative and memorable. And the students would see me here in front of them seeming totally confident and in control.But what they didn't see was me often before leaving home often before leaving home hunched over a toilet vomiting from pur ...