Helen Fisher

Any kind of novelty or excitement drives up dopamine in the brain, and dopamine is associated with romantic love.

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

Men have a psychological need to show off their courage and strength. When he sees you talking to another guy, that instinct kicks in and he jumps to protect you and prove he's worthy of your love.

I'm a huge Dallas Mavs fan. What I love about Dirk Nowitzki is he has just as much talent as everyone else, if not more, and he never toots his own horn. He's this silent warrior.

It's good to like yourself, and that only comes from hard work, from doing. But vanity is dangerous; it can trip you badly.

I have no neighbours other than animals and Joshua Trees.