There are 400,000 species of beetles on this planet, but only 8,000 species of mammals.

There are 400,000 species of beetles on this planet, but only 8,000 species of mammals.

Until politics are a branch of science, we shall do well to regard political and social reforms as experiments rather than short-cuts to the millennium.

The idea of protoplasm, which was really a name for our ignorance, [is] only a little less misleading than the expression "Vital force".

Shelley and Keats were the last English poets who were at all up to date in their chemical knowledge.

To the biologist the problem of socialism appears largely as a problem of size.

Blake expressed some doubt as to whether God had made the tiger. But the tiger is in many ways an admirable animal. We have now to ask whether God made the tapeworm. And it is questionable whether an affirmative answer fits in either with what we know about the process of evolution or what many of us believe about the moral perfection of God.