It’s rare that a book makes me want to go look up and read so many other books (not by the same author) but htis is that book. Marciano knows so many neat things about not just the US conversion (or lack) into metric measures but also historical measurement standardizers that may or may not have worked. He looks at the people, he looks at the policy and he looks at the geniuses as well as the kooks. Took me a long time to get through because it doesn’t always move forward speedily but mostly because I keep writing down other things I want to learn about: Metric Martyrs, Standard (and Detroit) time, a lot of other random things. Very good and very worth reading.