Everyone should have a completely useless skill which they are superlative at.

When I was little, being fascinated by calendars, I was able to recognize a month’s general pattern (starting on day X with Z days) as being identical to month M of year Y.

This is the type of skill whose acquiring is too dependent on the wonder of childhood; not knowing what is and isn’t important to be learned, the forming brain learns to instinctively be able to recognize certain combinations. Certainly the smaller set of existing months aids, but growing older, it is less learning and more memorization.

Now I’m not even sure what year it is.