Leopold cannot help but grin at the reassurance that people are still using his invention so far in the future. “We were beginning to use them, yes. Thank you for satisfying my curiosity on that small matter.”

He leans forward in the chair and tries not to wince. “I must also thank you again for that excellent cup of tea. It was most restorative. But do not let me detain you if you are required elsewhere.” Manners win out, as always, but he very much hopes that she will stay and keep him company a while longer.