They have their brains fused together and can still walk and talk? The flexibility of the growing brain never ceases to amaze me. It shows how robust the whole process of growing from a single cell really is. A human can grow in uncountable ways.

Given how the twins share sensory inputs, I wonder how memory and imagination works for them. As they "hear" each other thinking, do they also share common memories? If one remembers a scene, will the other remember it the same way? Or will it have to be narrated between them?

When one reads a book, will the other get the story? I would guess so. But will they share the imagined parts, or will they imagine the scenes individually?