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:

Dorothy Crowfoot Hodgkin’s Crystalline Chemistry, Part 2
43:14

Dorothy Crowfoot Hodgkin’s Crystalline Chemistry, Part 1
38:04

SYMHC Classics: Sarah Bradlee Fulton
32:28