Scientists know that women gravitate to men who have a different immune system from theirs.

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

Experiences shape the brain, but the brain shapes the way we view experiences, too.

There's biology in everything, even when you're feeling spiritual.

Blushing is thought to be linked to increased levels of norepinephrine in the brain, which may be associated with romantic feelings. It signals that we are interested and excited, which is attractive to men.

You know, when you've been dumped, the one thing you love to do is just forget about this human being, and then go on with your life - but no, you just love them harder.

In America, we are demanding everything from our marriage.