They're both such dynamic speakers and dynamic people that they absolutely capture your attention. For however long you're in there, they don't lose your attention, and there's something pretty incredible about that.

He revealed that at the very end of the lecture, and I've never heard a lecture hall so silent - you could have heard a pin drop. It was incredible, and I talked before about bringing a new perspective to history we know, and I think that was one instance where that was particularly true. To hear that weighty fact is something I won't forget anytime soon.