Everything we just covered revolves around a single question: What time is it? At a certain point we started asking this question. This became important to know when you could finally head home after work, for example (answer: never early enough). And for a long time that was fine, but that wasn’t entirely the question we were asking. There was a hidden implicit part of the question we were never asking: What time is it here? Once we started getting planes and trains and automobiles, we had move...