There is nothing quite like having John Carmack tell you about a technological breakthrough that excited him.
The id Software programming genius who co-created Doom and launches rockets in his spare time will just unload on you. And—this is flattering—he will assume you can keep up.
Yesterday at E3 in Los Angeles, I pretty much just asked Carmack to explain why he's programming the re-release of Doom 3 to work with a prototype $500 head-mounted display. His response was pure Carmack, a dozen-minute nearly uninterrupted oral dissertation on the ins and outs of head-mounted tech.