Publicly and among themselves biologists rightly celebrate the diversity of life on Earth... At the end of the day, however, their confession is heard by no one: they work with a single scientific sample-life on Earth.

When everyone agrees to a single solution and a single plan, there's nothing more efficient in the world than an efficient democracy.

The chunks of comet Shoemaker-Levy 9 were so large, and were moving so fast, that each hit Jupiter with at least the equivalent energy of the dinosaur-killing collision between Earth and an asteroid 65 million years ago. Whatever damage Jupiter sustained, one thing is for sure: it's got no dinosaurs left.

The last person I ever want working for me is someone who says 'that's not in my job description.

I don't see why there is no intelligent alien life in the universe.

If you look at the history of unexplained phenomena that was first explained by spiritual, mystical forces, the track record is not very good for the mystical, magical explanations to survive against more quote "mundane" physical explanations.

Newton, Einstein, and every other great scientist in history...They all made mistakes. Of course they did. They're human! Science is a way to keep from fooling ourselves and each other.