Science, my lad, is made up of mistakes, but they are mistakes which it is useful to make, because they lead little by little to the truth.

Of course in science there are things that are open to doubt and things need to be discussed. But among the things that science does know, evolution is about as certain as anything we know.

The work of science is to substitute facts for appearances, and demonstrations for impressions.

To me there has never been a higher source of earthly honor or distinction than that connected with advances in science.

Political ideology can corrupt the mind, and science.