[ Ah! He smiles at her as she talks, curious but a little wry despite himself. ]

I haven't much of a head for science, I admit, but... I can understand. I spent a long time knowing nothing about... well, all the parts of London most people don't see. It was a little strange to have it all come out so late in my life, everything I thought I understood suddenly... different. I think I'm still adjusting, truth be told.