Helen Fisher

For so many generations, a woman's only career path was to marry well and to marry up. Those days have changed.

Office romances are few, short, and not usually destructive.

Since when is anyone truly honest with anyone?

Women are better at reading body language everywhere in the world. As a matter of fact, it's associated with the female hormone estrogen. Women are better at figuring out of tone of voice, reading your face and posture and gesture.

Throughout evolution, ostracism was death indeed.

When somebody leaves Match.com or Chemistry.com, they ask you why you left. One box you can check is, 'I found somebody.' Between 15 and 20 percent of people check that box.

People have been looking for love potions since hunter-gatherer societies.

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.

As social animals, we need to exchange juicy tales about someone - to connect with one another. For millions of years our forebears must have sat around the campfire, whispering about everyone they knew.

We all have restlessness in long-term relationships.

Hair that gleams can send a clear sign that you're young and in your prime, whatever your actual age.

The Internet lets women use words, which is their natural tool. Little girls speak in more complex, grammatical sentences than little boys do, and women never lose that superiority in verbal ability.

We're not very dangerous animals; we don't have a horn like a rhino or quills like a porcupine.

Women are very attracted to a low voice because it's linked to testosterone, which for millions of years was a sign that men had very good spacial skills and would have been very good at hunting and finding their way back home.

Women spend their lives trying to look good for men. So a woman who feels she's sending the right visual signals is pleased with herself.

As a group, anthropologists are not too fond of people who work in the business world.

When people tell you to walk a certain way, it's like not thinking of a purple tomato. You can't not do it.

Despite the myth that men are less committed, they are predisposed to desire marriage.

Today, most women are surrounded by ingenious gadgets. They don't grow the peas or raise the chicken that they serve for dinner; instead they hunt and gather in the grocery store. They go through catalogs or department stores to buy clothes instead of shearing sheep, carding wool, and weaving cloth for skirts and coats and blankets.

Saliva has testosterone and estrogen. When you kiss, you're having a chemical experience.