If all the stars and galaxies in the universe today were smoothed out into a uniform sea of atoms, there would only be about one atom in every cubic meter of space.

Once upon a time when there was no time.

We can never know the origins of the universe. The deepest secrets are the ones that keep themselves.

History is full of people who thought they were right -- absolutely right, completely right, without a shadow of a doubt. And because history never seems like history when you are living through it, it is tempting for us to think the same.

There was no "before" the beginning of our universe, because once upon a time there was no time.

Some things are as they are regardless of what they were.

There is no reason that the universe should be designed for our convenience.