Democritus's work on the void was revolutionary.

Theorists write all the popular books on science: Heinz Pagels, Frank Wilczek, Stephen Hawking, Richard Feynman, et al. And why not? They have all that spare time.

Physics isn't a religion. If it were, we'd have a much easier time raising money.

The physicists defer only to mathematicians, and the mathematicians defer only to God.

I sometimes think about the tower at Pisa as the first particle accelerator, a (nearly) vertical linear accelerator that Galileo used in his studies.

Those who do not stop asking silly questions become scientists.

We hope to explain the entire universe in a single, simple formula that you can wear on your T-shirt.

Science should have no less lofty a goal. My ambition is to live to see all of physics reduced to a formula so elegant and simple that it will fit easily on the front of a T-shirt.

My children have often asked me why I never received a Nobel Prize. I used to tell them it was because the Nobel committee couldn’t make up its mind which of my projects to recognize.

I'm so old I can remember when the Dead Sea was only sick.

One of the major ingredients for professional success in science is luck. Without this, forget it.

So, what you're saying is, just because a warrior is a woman doesn't mean they yhave to wear a chain mail bikini? Like, they could wear...real armor?

Scholarship that is indifferent to human suffering is immoral.

And there's the beauty of space. A billion paths to choose.

Painting n: the art of protecting flat surfaces from the weather and exposing them to the critic.

Let them march all they want, as long as they continue to pay their taxes.

There isn't anything in your life that cannot be changed.

And, of course, customers really need to feel safe and are seeking reassurance when they fly.

The biggest looters are the British Museum.

I commend women who wake up 30, 40 minutes early to put on eyeliner. I think it's ­beautiful. I'm just not that person.

Expand your notion of what adversity is.