Le livre est gros, je vais coller un extrait, désolé c'est en anglais :
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With still other traits, the average values for the two sexes differ by smaller amounts and in different directions for different traits. Though men, on average, are better at mentally rotating objects and maps, women are better at remembering landmarks and the positions of objects. Men are better throwers; women are more dexterous. Men are better at solving mathematical word problems, women at mathematical calculation. Women are more sensitive to sounds and smells, have better depth perception, match shapes faster, and are much better at reading facial expressions and body language. Women are better spellers, retrieve words more fluently, and have a better memory for verbal material.
Women experience basic emotions more intensely, except perhaps anger. Women have more intimate social relationships, are more concerned about them, and feel more empathy toward their friends, though not toward strangers. (The common view that women are more empathic toward everyone is both evolutionarily unlikely and untrue.) They maintain more eye contact, and smile and laugh far more often. Men are more likely to compete with one another for status using violence or occupational achievement, women more likely to use derogation and other forms of verbal aggression.
Men have a higher tolerance for pain and a greater willingness to risk life and limb for status, attention, and other dubious rewards. The Darwin Awards, given annually to ―the individuals who ensure the long-term survival of our species by removing themselves from the gene pool in a sublimely idiotic fashion,‖ almost always go to men. Recent honorees include the man who squashed himself under a Coke machine after tipping it forward to get a free can, three men who competed over who could stomp the hardest on an antitank mine, and the would-be pilot who tied weather balloons to his lawn chair, shot two miles into the air, and drifted out to sea (earning just an Honorable Mention because he was rescued by helicopter).
Women are more attentive to their infants‘ everyday cries (though both sexes respond equally to cries of extreme distress) and are more solicitous toward their children in general. Girls play more at parenting and trying on social roles, boys more at fighting, chasing, and manipulating objects. And men and women differ in their patterns of sexual jealousy, their mate preferences, and their incentives to philander.
Many sex differences, of course, have nothing to do with biology. Hair styles and dress vary capriciously across centuries and cultures, and in recent decades participation in universities, professions, and sports has switched from mostly male to fifty-fifty or mostly female. For all we know, some of the current sex differences may be just as ephemeral. But gender feminists argue that all sex differences, other than the anatomical ones, come from the expectations of parents, playmates, and society.
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J'ai un peu la flemme de le paraphraser, en gros dans le bouquin il démonte avec brio toutes les théories qui prennent pas en compte la biologie dans leur argumentaire.
Il défend l'idée que les gènes jouent un rôle au moins aussi important que l'environnement.