"The human failing I would most like to correct is aggression. It may have had survival advantage in caveman days, to get more food, territory or partner with whom to reproduce, but now it threatens to…"

"The greatest danger for our future is apathy."

"The universe is a place of endless possibilities, and we are just beginning to explore them."

"The fact that we humans, who are ourselves mere collections of fundamental particles, have been able to come this close to an understanding of the laws governing us and our universe is a great triumph…"

"There are no black holes, only gray holes."