When you are pushing a lawn mower around, there's not much need to be givingh all your attention to the task, so your mind can wander off to strange topics which raise interesting, but not often considered, questions.
1. If the oveernight temperatur gets to 0C or less and ice forms on things, why doesn't the freeze kill plants that grow in the winter?
2. If The Romans were in control of Judea at the time of Christ, and Roman currency was the currency of the Empire, why did they need money changers at the temple in Jerusalum?