It is a law of nature we overlook, that intellectual versatility is the compensation for change, danger, and trouble. An animal perfectly in harmony with its environment is a perfect mechanism. Nature never appeals to intelligence until habit and instinct are useless. There is no intelligence where there is no change and no need of change. Only those animals partake of intelligence that have a huge variety of needs and dangers.

Money means in a thousand minds a thousand subtly different, roughly similar, systems of images, associations, suggestions and impulses.

In all ages, far back into prehistory, we find human beings have painted and adorned themselves.

Statistical thinking will one day be as necessary for efficient citizenship as the ability to read and write!

There are no social differences - till women come in.

I saw a gray-haired man a figure of hale age, sitting at a desk and writing.

Biologists can be just as sensitive to heresy as theologians.