I recall Carmack used to go on week-long Sabbaticals, where he would lug his computer to a hotel room and do research. It's probably along those lines, though

I recall Carmack used to go on week-long Sabbaticals, where he would lug his computer to a hotel room and do research. It's probably along those lines, though I doubt his wife and kid(s) would allow him to do that these days ;)