After my son is tucked into bed at night, Christine and I can sometimes hear him pretending to be his current favorite hero. “Hello,” he says in a robotic voice, “My name is Stephen Hawking. My body does not work, and I have to speak through a computer but, in my mind, I am FREEEEEE! CHECK IT OUT!” (This portrait of Dr. Hawking was drawn for him, my son, by request.)