The principle of science, the definition, almost, is the following: The test of all knowledge is experiment. Experiment is the sole judge of scientific "truth." But what is the source of knowledge? Where do the laws that are to be tested come from? Experiment, itself, helps to produce these laws, in the sense that it gives us hints. But also needed is imagination to create from these hints the great generalizations--to guess at the wonderful, simple, but very strange patterns beneath them all, and then to experiment to check again whether we have made the right guess.

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

The work I have done has, already, been adequately rewarded and recognized. Imagination reaches out repeatedly trying to achieve some higher level of understanding, until suddenly I find myself momentarily alone before one new corner of nature's pattern of beauty and true majesty revealed. That was my reward.

There is nothing that living things do that cannot be understood from the point of view that they are made of atoms acting according to the laws of physics.

Today's brains are yesterday's mashed potatoes.

It turns out that all life is interconnected with all other life.

This is not yet a scientific age.