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

Every time you cuddle with your children, you're likely to be driving down your testosterone.

You can really get poked in the back and not feel it very much, but just a feather around your lips and you really do feel it.

Romantic love allows you to focus mating energy. Attachment sustains that relationship as long as necessary to raise your baby.

We still have community, but we don't seem to have local community. Even in a small town where you know your neighbors and your mother's down the street, they're not in arm's length.

I think romantic love evolved to enable you to focus your mating energy on just one individual at a time, thereby conserving mating time and energy.