“It may not look it, but all the glass on Earth is flowing downwards under the relentless drag of gravity. Remove a pane of really old glass from the window of a European cathedral and it will be noticeably thicker at the bottom than at the top.”

“Dogs don't like me. It is a simple law of the universe, like gravity. I am not exaggerating when I say that I have never passed a dog that didn't act as if it thought I was about to take its Alpo. Dogs that have not moved from the sofa in years will, at the sniff of me passing outside, rise in fury and hurl themselves at shut windows. I have seen tiny dogs, no bigger than a fluffy slipper, jerk little old ladies off their feet and drag them over open ground in a quest to get at my blood and sinew. Every dog on the face of the earth wants me dead.”

“Look at a globe and what you are seeing really is a snapshot of the continents as they have been for just one-tenth of 1 per cent of the earths history.”

“Strange as it may seem, wrote Richard Feynman, we understand the distribution of matter in the interior of the Sun far better than we understand the interior of the Earth.”

“Physics is really nothing more than a search for ultimate simplicity, but so far all we have is a kind of elegant messiness.”

“[About Uluru] I'm suggesting nothing here, but I will say that if you were an intergalactic traveler who had broken down in our solar system, the obvious directions to rescuers would be: "Go to the third planet and fly around till you see the big red rock. You can't miss it." If ever on earth they dig up a 150,000-year-old rocket ship from the galaxy Zog, this is where it will be. I'm not saying I expect it to happen; not saying that at all. I'm just observing that if I were looking for an ancient starship this is where I would start digging.”

“Most of what has lived on Earth has left behind no record at all.”