"I believe alien life is quite common in the universe, although intelligent life is less so. Some say it has yet to appear on planet Earth."

"I tell my kids: Don't spend all your time at the computer. But then I realize, I do that myself all day."

"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

"The universe is a vast and complex place, and we are only just beginning to understand it."

"Wrong again, Albert."