This summer we changed our prop zincs. When we noticed a diver in Kinsale, Ireland cleaning bottoms, we asked him to change ours. We had only had them five months and they could easily have gone the rest of the year, but since he was available we decided to change them anyway.

What is interesting here is that we seem to have less wear when we are moving a lot than when we are sitting tied to a dock.

Same thing is probably true of our minds and bodies.