Children in backseats cause accidents. Accidents in backseats cause children.

If we ever do find a complete theory of the universe, it would be a great triumph of human reason but it wouldn't leave much for us to do. We need an intellectual challenge.

I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road.

Success is a relative term. It brings so many relatives.

I believe in the possible. I believe, small though we are, insignificant though we may be, we can reach a full understanding of the universe. You were right when you said you felt small, looking up at all that up there. We are very, very small, but we are profoundly capable of very, very big things.

Many badly needed goals, like fusion and cancer cure, would be achieved much sooner if we invested more.

thus, in a sense, we are all doomed. even if we stay away from black holes