At age three, if you have a still-growing brain, it's a human behavior. In chimps, by age three, the brain is formed over 90 percent. That's why they can cope with their environment very easily after birth - faster than us, anyway. But in humans, we continue to grow our brains. That's why we need care from our parents.
Zeresenay AlemsegedRelated topics
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It appears to [Nietzsche] that the modern age has produced for imitation three types of man ... First, Rousseau's man, the Titan who raises himself ... and in his need calls upon holy nature. Then Goethe's man ... a spectator of the world ... [Third] Schopenhauer's man ... voluntarily takes upon himself the pain of telling the truth.
Georg Brandes
In contrast to our own social environment which brings out different aspects of human nature and often demonstrated that behavior which occurs almost invariably in individuals within our society is nevertheless due not to original nature but to social environment; and a homogeneous and simple development of the individual may be studied.
Margaret Mead
American housewives have not had their brains shot away, nor are they schizophrenic in the clinical sense. But if ... the fundamental human drive is not the urge for pleasure or the satisfaction of biological needs, but the need to grow and to realize one's full potential, their comfortable, empty, purposeless days are indeed cause for a nameless terror.
Betty Friedan