Collective human actions are transforming, even ravaging, the biosphere - perhaps irreversibly - through global warming and loss of biodiversity.

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".

Fine, I'll teach you, ''Besides, there's only so many times a girl wants to fall on her butt in front of the boy she's out to impress.

It's healthy to say uncle when your bone's about to break.

Whirlyball is only the most awesome sport on the planet! It's like bumper cars plus lacrosse meets basketball.

So, what is creative freedom? We can make what we want, how we want. The only constraint is: not for any budget.

The great dramatist has something better to do than to amuse either himself or his audience. He has to interpret life.

We must do more and with more urgency to empower women.

You shouldn't be able to be alive and you are. You want to trade?

Don't let what others think or say get in your way; their actions reflect on them, not you.

The church does not simply have a missions department; it should wholly exist to be a mission.

One of the things I love about theater, one of the reasons I'll never give it up, is that it's fifty percent the audience's responsibility.