Experimental evidence is the final arbiter of right and wrong.

Sometimes attaining the deepest familiarity with a question is our best substitute for actually having the answer.

Science is the process that takes us from confusion to understanding.

When kids look up to great scientists the way they do to great musicians and actors, civilization will jump to the next level

Exploring the unknown requires tolerating uncertainty.

We're on this planet for the briefest of moments in cosmic terms, and I want to spend that time thinking about what I consider the deepest questions.

Intelligence is the ability to take in information from the world and to find patterns in that information that allow you to organize your perceptions and understand the external world.

I was holding [my four-year-old daughter] and I said, 'Sophia, I love you more than anything in the universe.' And she turned to me and said, 'Daddy, universe or multiverse?'

Free will is the sensation of making a choice. The sensation is real, but the choice seems illusory. Laws of physics determine the future.

All you are is a bag of particles acting out the laws of physics. That to me is pretty clear.

Physics grapples with the largest questions the universe presents. Where did the totality of reality come from? Did time have a beginning?

It is imperative that we replace those who think they own this country, with those who built it.

You may shoot me with your words, You may cut me with your eyes, You may kill me with your hatefulness, But still, like air, I’ll rise.

Reading a great novel gives the same feeling you have when you fall in love.

OUR MOTHER EARTH CAN LIVE WITHOUT US BUT WE CANT LIVE WITHOUT HER

Let us never forget the duty, which we have taken upon us

It's not always enough to be brave, I realized years later. You have to be brave and contribute something positive, too. Brave on its own is just a party trick.

He who sling mud, lose ground.

Unfortunately, there's no greater rhyme or reason as to why it would be me. And since there is no answer as to why me, it's not a question I feel really entitled to ask.

I used to sing songs and write with my uncle, Bill Owens.

It is a man dying with his harness on that angels love to escort upward.