And you are made of a hundred trillion cells. We are, each of us, a multitude.

When you make the finding yourself - even if you're the last person on Earth to see the light - you'll never forget it.

Organic as a dandelion seed, [the ship of our imagination] will carry us to worlds of dreams and worlds of facts

We are made of starstuff.

Every star may be a sun to someone.

If the greenhouse effect is a blanket in which we wrap ourselves to keep warm, nuclear winter kicks the blanket off.

As agonizing a disease as cancer is, I do not think it can be said that our civilization is threatened by it. ... But a very plausible case can be made that our civilization is fundamentally threatened by the lack of adequate fertility control. Exponential increases of population will dominate any arithmetic increases, even those brought about by heroic technological initiatives, in the availability of food and resources, as Malthus long ago realized.