Someone told me that each equation I included in the book would halve the sales.

Never put off the work till tomorrow what you can put off today.

If it were only a few degrees, that would be serious, but we could adapt to it. But the danger is the warming process might be unstable and run away. We could end up like Venus, covered in clouds and with the surface temperature of 400 degrees. It could be too late if we wait until the bad effects of warming become obvious. We need action now to reduce emission of carbon dioxide.

Nothing is better than reading and gaining more and more knowledge.

I believe in the possible. I believe, small though we are, insignificant though we may be, we can reach a full understanding of the universe. You were right when you said you felt small, looking up at all that up there. We are very, very small, but we are profoundly capable of very, very big things.

The media need superheroes in science just as in every sphere of life, but there is really a continuous range of abilities with no clear dividing line.

We are all now connected by the Internet, like neurons in a giant brain.