https://www.theallusionist.org/allusionist/pleaseThe Allusionist is my current choice of podcast when I walk, and this episode, on the use of 'please' and how it's done in different parts of the world, struck me as something that the rest of you might like. The episode page has a link to a transcript for anyone who would rather read than listen. The whole thing is only about 15 minutes.
The next episode, about continents, has some follow up at the end about how and when and to whom we say thank you.