Minor comment: the first COVID examples show two thermometers with 90° , which I guess is Fahrenheit. > 95% of the world population uses Celsius, so this seems a bit USA (and Liberia, etc.) specific (unless you try to boil water). :)
I tried looking at your book website but the certificate is expired and wouldn't let me in with my old browser. I was able to on a newer browser by accepting the risk, but thought you should know.
Different styles, though. This artwork mostly uses hard outlines, whereas your link uses just filled paths (which by the way makes them easier to scale).
Minor comment: the first COVID examples show two thermometers with 90° , which I guess is Fahrenheit. > 95% of the world population uses Celsius, so this seems a bit USA (and Liberia, etc.) specific (unless you try to boil water). :)
https://en.wikipedia.org/wiki/Celsius#/media/File:Countries_...