Odor carries a great deal of information, including information about a potential mate's age, sex, fertility, identity, emotions, and health.

Some men may be genetically inclined to have and hold a single partner, while some may not. In the near future, young women who stay current with the scientific literature may demand genetic tests of their boyfriends to assess how likely they are to make faithful husbands.

Many people prefer a view of human nature that includes a true side and a false side - in other words, humans have a single genuine aim and the rest is decoration, evasion, or cover-up. That's intuitive, but it's incomplete. A study of the brain necessitates a more nuanced view of human nature.

If our brains were simple enough to be understood, we wouldn't be smart enough to understand them.

Among all the creatures of creation, the gods favor us: We are the only ones who can empathize with their problems.

Just give the brain the information and it will figure it out.

Imbalance of reason and emotion may explain the tenacity of religion in societies: world religions are optimized to tap into the emotional networks, and great arguments of reason amount to little against such magnetic pull.