Jon Udell: I'm deeply fascinated by the idea of tacit
knowledge, which is the stuff that we don't know that we know, or that we assume that everyone knows so never bother to explain. To paraphase the philosopher Michael Polanyi, whom I cited in The tacit dimension of tech support, tacit knowledge means knowing more than we can (or do) tell.
Jon's focus was on screencast, but he also mentioned pair programming as a conduit through which tacit knowledge may flow. I had this experience many years ago:
Me: What did you just do? Eric: I just hit Control-B.
Control-B, of course is bound to "Go to declaration" in IDEA. :)