I spend about half of my time teaching programming classes, and I love it when my students ask me about something, and I have NO IDEA WHATSOEVER what they're ta

I spend about half of my time teaching programming classes, and I love it when my students ask me about something, and I have NO IDEA WHATSOEVER what they're talking about. If I can do some quick research, and answer them on the spot, I do so. But it's not unusual for me to give myself "homework," and then on the next day of the course I'm teaching, to tell them what I've learned. In many such cases, I've been quite surprised to discover just how little I know, even after many years of using certain technologies. And I'm thus very slow to wonder how an expert could not know something. We all work with a subset of a programming language, and while I might expect or hope that all experts would know all things, that's not the case. To my mind, it's more important that someone knows how to ask questions, read books, accumulate new knowledge, and then assimilate it into what they already know than to come with an encyclopedic understanding of a technology.