Man is the only mammal whose normal method of locomotion is to walk on two legs. A pattern of mammal behavior that emerges only once in the whole history of life on earth takes a great deal of explaining.

Considering the very close genetic relationship that has been established by comparison of biochemical properties of blood proteins, protein structure and DNA, and immunological responses, the differences between a man and a chimpanzee are more astonishing than the resemblances.

I believe the deeply rooted semantic confusion between 'man' as a male and 'man' as a species has been fed back into and vitiated a great deal of the speculation that goes on about the origins, development, and nature of the human race.

It's just as hard for man to break the habit of thinking of himself as central to the species as it was to break the habit of thinking of himself as central to the universe. He sees himself quite unconsciously as the main line of evolution, with a female satellite revolving around him as the moon revolves around the earth. This not only causes him to overlook valuable clues to our ancestry, but sometimes leads him into making statements that are arrant and demonstrable nonsense.

It takes two to make a woman into a sex object.

The trouble with specialists is that they tend to think in grooves.

Where else is fatness at a premium? The answer is clear. There are two classes of mammals which are liable to accumulate large quantities of adipose tissue - hibernating mammals and aquatic mammals.