Science is what we do to keep us from lying to ourselves

We absolutely must leave room for doubt or there is no progress and no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty.

If all of this, all the life of a stream of water, can be nothing but a pile of atoms, how much more is possible?

If you're doing an experiment, you should report everything that you think might make it invalid - not only what you think is right about it; other causes that could possibly explain your results; and things you thought of that you've eliminated by some other experiment, and how they worked -to make sure the other fellow can tell they have been eliminated.

There are 10^11 stars in the galaxy. That used to be a huge number. But it's only a hundred billion. It's less than the national deficit! We used to call them astronomical numbers. Now we should call them economical numbers.

The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.

The world is a dynamic mess of jiggling things