This column is about hair, the stuff on your head. I’m at the point in life when I am very thankful that I have hair on my head, even if it is thinning and changing shades. I don’t mean to aggravate my contemporaries who are follicle-y challenged, but I have only one weak spot: that male-pattern baldness I inherited from my father – the crown of the head, monk-like bald spot.

I used to do a genetics activity with my eighth-graders in which I showed them my bald spot and told them my father had…