Nuclear weapons can be dismantled, but they cannot be uninvented.

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".

When you have faults, do not fear to abandon them.

A child playing with its father screams louder, laughs harder, jumps more eagerly, puts more faith in everything.

However hard and however long we love someone who has died, they can never love us back. At least that is how it feels...

We allow each other to pursue our goals. I wouldn't want to be married to someone who was not happy with what they were doing with their life and Bono wouldn't either.

There are individuals who have never done anything for Jesus Christ, and I have no doubt there are preachers as well, who have never done anything for the God Almighty.

Anything I do, I spend a lot of time. I do it with passion and intensity. I want to be in charge.

Women vibrate at a slightly different rate that passes kundalini very easily. It is problematic though, because a woman also picks up negative energy, it affects her more.

A five-minute teacher understands that peers' words can carry a lot more weight than his or her own, and there is nothing wrong with students doing the teaching.

The patter of their feet as they walk through Jim Crow barriers to attend school is the thunder of the marching men of Joshua, and the world rocks beneath their tread.

You will never draw the sense of a thing unless you are feeling it at the time you work.