Are you one of those people who always runs a little late? Do you set your clock ahead a few minutes in an effort to be on time, only to be thwarted because you mentally adjust for the fact that your clock is known to be fast? If so, here's a solution for you: a clock that runs an undefined number of minutes fast, with the exact amount changing within a defined range. As such, you know you're a bit ahead but you don't know how much, so you'd better be on the safe side and leave now just in case. Hey, it could work. Link via Crooked Timber.