"Most people are from Earth. Which... I have to tell you, that's nothing more than a legend to people in my time. Most of us don't even believe it exists. It's only a myth. So I know what you mean when people talk about places you've never heard of."

Same thing with strange words, although he's not a kid and can usually infer some kind of meaning, somewhere along the line, sooner or later.

"It's why I try not to make any assumptions. But let me make you this offer: if there's something you don't know and you don't know who to ask or don't want to ask for whatever reason, you can always try me. If I know it, I'll explain it. If I don't, I'll tell you that, too."

Seems like a fair enough deal to him.