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

I do not believe in a personal God.

A model is a good model if first it interprets a wide range of observations in terms of a simple and elegant model, and second if the model makes definite predictions that can be tested, and possibly falsified, by observation.

If I have questions about the universe on my mind when I go to bed, I can't turn off. I dream equations all night.

One can't prove that God doesn't exist. But science makes God unnecessary. The laws of physics can explain the universe without the need for a creator.

Scientific discovery may not be better than sex, but the satisfaction lasts longer.

The increase of disorder or entropy with time is one example of what is called an arrow of time, something that distinguishes the past from the future, giving a direction to time.