I remember seeing that video, and others like it at Oculus. The variety and depth of his knowledge is truly astounding, as is his ability to talk about it witho

I remember seeing that video, and others like it at Oculus. The variety and depth of his knowledge is truly astounding, as is his ability to talk about it without rambling. Every time he switched topics, you knew there was so much more he could have said. When I was a technical evangelist, I regularly gave hour long technical presentations to relatively large ballrooms and it's ridiculously hard to maintain focus. The fact that Carmack gives a detailed talk rather than a presentation or speech is already a distinction, but mostly off the cuff, for hours, non-stop, to a packed conference hall? Impressive doesn't describe it.