Dr. Rosenfeld opened a notebook. "You’re ninety-four years old. Your records tell me that you’ve lost about 12 percent of the neuronal and glial tissue that you had when you were, say, twenty. That’s perfectly normal and natural, but NTDCD is very, very far from normal and natural. You’re going to get all that tissue back—not the original tissue, mind you, but a new infiltration of fresh brain tissue that is essentially unimprinted. And brain tissue is not something you can turn on and turn off, plug in or plug out. It’s going to be part of you. The new you."