Animal language is a contagious expression of mood effecting communication between social partners.

What could not be denied was that in vast segments of the animal world natural selection of the most qualified individuals took place not by competition for females but by competition for space.

Is it possible that the environmental severity of the 1930s induced-particularly in the most aware, alert, and compassionate of [British] men-a morality which makes no sense today?

For the soundest of evolutionary reasons man appears at his best when times are worst.

A human being is a problem in search of a solution.

We are born of risen apes, not fallen angels.

Human war has been the most successful of our cultural traditions.