Hal hid his intelligence. You'd never know it until you got to know him. He was well-liked, and even put up with the likes of me. (A lot of techers put up with me, and even generously helped me to not flunk out. I had a lot of growing up to do.)

I would have had a lot less trouble with Quantum Mechanics if I'd realized that nobody understands it, it's just that the math works. I thought it was just me that thought it was crazy.