A few years ago, when I was new to web-searching and I was curious about other people with my name, I got in touch with the chemistry prof who co-wrote that book. There are not many of us by the name of “Charles/Charlie Henrickson,” spelled that way—maybe five of us in the country that I’ve seen on Google. Of course, over in Sweden, “Karl/Kalle Henriksson” is a fairly common name. (That was my grandfather’s name over there, before he came to this country, and I am named after him.)