People compose poetry, novels, sitcoms - for love.
Women are naturally prone to compete over their mates.
I can't conceive of caring more about my president than my own partner.
The Great Depression of the 1930s saw more American unmarried women working from nine to five, mostly in repetitive, boring, subordinate, dead-end jobs. But the number of working women doubled between 1870 and 1940. During World War II it doubled once again.
Of all the foods we share, there is nothing more primordial than meat. It's no surprise that meat-eaters still want a partner who will give, receive and share this primordial symbol of a budding partnership.
As a group, anthropologists are not too fond of people who work in the business world.
Any time you choose not to hide your tattoo, you're limiting your social sphere, because they're not popular in big business.
In America, we are demanding everything from our marriage.
There are cognitive processes and limbic reactions associated with basic emotions. And you can change brain chemistry, but you're still not going to change memories and experiences in a human being.
Men couldn't care less if your strands are perfectly styled and neat. In fact, he might like you more with some wildness or bedhead, since it shows you're carefree and relaxed.
When chimps threaten, they open their mouth and show their teeth. It's a little like waving a knife in front of you. It's very primitive, and therefore bizarre.
Men tend to be hierarchical, but women are driven to make lateral connections so they can cooperate.
Women, it turns out, are built to lead - particularly in the modern world.
Along with our many human propensities, we evolved a huge cerebral cortex with which we make decisions.
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