Experiments that crash atoms together could start a chain reaction that erodes everything on Earth.

In future, children won't perceive the stars as mere twinkling points of light: they'll learn that each is a 'Sun', orbited by planets fully as interesting as those in our Solar system.

Absence of evidence is not evidence of absence.

It will not be humans who watch the sun's demise, six billion years from now. Any creatures that then exist will be as different from us as we are from bacteria or amoebae.

I think a few hundred years from now we'll start having the 'posthuman' era of different species.

It's better to read first rate science fiction than second rate science-it's a lot more fun, and no more likely to be wrong.

We need to broaden our sympathies both in space and time - and perceive ourselves as part of a long heritage, and stewards for an immense future.

Science is a part of culture. Indeed, it is the only truly global culture because protons and proteins are the same all over the world, and it's the one culture we can all share.

I hope that by 2050 the entire solar system will have been explored and mapped by flotillas of tiny robotic craft.

I'm not myself religious but have no wish to insult or denigrate those who are.

Crucial to science education is hands-on involvement: showing, not just telling; real experiments and field trips and not just "virtual reality".

If two people are so unalike, as you and I, they are pleased when they discover points of agreement. But if they are as alike as Nietzsche and I, they suffer from their differences.

Days passed in a grey fog. I was becalmed. Without energy, without hope, with no sight of land, I could remember feeling better but I somehow couldn't believe in it. There was nothing but this.

To be a better person, spend less time filling out your personal scorecard and more time being kind . . . to you.

I believe that love is better than hate. And that there is more nobility in building a chicken coop than in destroying a cathedral.

The best time to make friends is before you need them.

Go out and do the things you are afraid to do gradually. Gain the power to do that through meditating. You will find yourself limitless reality that knows no fear.

What you try to become is a bringer of magic, for magic and the truth are closely allied and movies are sheer magic ... when they work, it's, well, it's glorious.

He is a very humble man, that thinks not himself better than some others.

People who dwell in God dwell in the eternal now.

It looks to me like any man that wants to be President in times like these lacks something.