“No,” George agreed. “But it’s annoying. And I live with it. You will too. Or you won’t. But either way, you’re still you.”

The tremor was subtle—a slight wobble in his left hand when he tried to write equations. To anyone else, it was nothing. To Sheldon, it was chaos.

Mary laughed softly—a real laugh, tired but warm. “When did you get so wise?”