Books on etiquette don’t necessarily reflect rules everyone is actually following – they’re more like what the author thinks the ideal standard of behavior should be. This episode looks at six such books from history.
Research:

Robert Moses and the Shaping of New York, Part 1
41:59

SYMHC Classics: Eradication of Smallpox
43:25

Behind the Scenes Minis: Progressive Medicine
22:11