"Feel free to interrupt me if you have any questions, you are as of right now my most important project."

And now Bruce can study some etiquette!

This etiquette will get the heck studied out of it. He makes flashcards for spaced repetition and keeps a written list of questions about important-seeming ambiguities.

When Eli wakes up he can help explain ambiguities. 

(He keeps getting distracted by asking about how Bruce's society works without any subs or doms.) 

Bruce takes more notes and answers questions! His society uses gender for some things and other things just get ignored or handled ad-hoc by individual people. "We should really name these Earths, we can't just keep calling them 'here' and 'my world'."

"We could call yours, I don't know, Contra Naturam. --Did that go through?"

"It sounded like Latin--against nature? It's a cool pair of words but I feel like whatever the laws of nature are they include multiple worlds and complaining about it won't help. How about the Latin for 'different nature' or something?"

"No, as in, unnatural sex. Like you guys keep having."

Startled chuckle. "That's less unaesthetic than complaining about physics, but, look, people there would think people here are having unnatural sex all the time. Let's name it after how we have more continents or something."

"So we're 'Insula' and you're 'Continentem'?"

"I like it. It's literally a difference you can see from space and it's really unambiguous which is which." 

It's kind of nuts that he is, totally by accident, in a position to get to name planets. Where by nuts he means awesome.

"You would presumably know this! Because your planet has been to space!"

"Yeah. I wish I could show you pictures of my planet from space; they're beautiful."

"It's really unfair. If someone a month ago had asked me about the Planet of the Nondynamics I'd assume that they'd all be as interested in natural philosophy as I am."

"Sadly, no. I guess we might be more interested in it than people here if only because there have been more total cool discoveries so far."

"Assuming we've been civilized for the same amount of time."

"Ah, no, sorry, I meant the causality going the other way--we've had more time to discover things and having all the discoveries to read about makes people interested in science. Though I don't actually know if there are any milestones both worlds have that are long ago and precisely dated enough to tell if one history is meaningfully ahead of the other. Did you have, hm, are there big pyramids at Giza?"

"Yes! Yes there are."

"Cool. The ones in my world were built . . . I don't exactly remember the archaeologists' estimate and I think it had some error bars on it and also building them took a while, but it was within a couple decades of forty-five hundred years ago."

Eli stands up, rummages around for a book, and reports back, "About thirty-eight hundred years ago."

"Wow. So either our ancient Egypts were already really different or you've actually had way faster technical progress than us. I would have guessed we have maybe two hundred years of innovations you don't; definitely not seven hundred. Maybe it's because your Roman Empire ended differently."

"Yeah, it didn't really end so much as... fade, kind of. It's why you have lots of people of African descent in Anglia."

"Because it was easier to move from place to place for a long time? Neat." He remembers a very silly meme from several years ago in his world; apparently the silly meme person had like 3% of a point.

"Yeah. Is your world"-- he gestures vaguely-- "are all the Anglian-equivalents pale?"

Bruce drags a hand over his face. "Okay, so, the history of interactions between people with different skin colors on my world is extremely depressing and I'm embarrassed on behalf of everyone involved, but basically yes, the British Isles do have a very small fraction of people of African descent."