They were there in the caves of the Neolithic Stone Age. They were there in the temples of ancient Egypt and Rome. They were there at the coronation of King Henry IV. They were there on Napoleon’s battlefields. And they were there, in my very own house, just last month.

Lowly, unlovely lice, that is. Despite their unwavering lineage, I was shocked to find them crawling on my own children. I knew that lice still existed, of course, but I had always assumed that they belonged in someone else’s house. So despite receiving a letter from school alerting parents of an infestation, it took three days of watching my son furiously scratching his neck before I realized that he might not have mosquito bites.

The moment I checked, there they were: little wingless, bloodsucking insects skittering over his… More…