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.

Why do men fight who were born to be brothers?

If we think of the immune system as a machine, then we are far from even knowing all of its parts.

I watch comedies most of the time. That's what I gravitate toward. But I think the kinds of roles people see me in are sort of the opposite of that. I'm not really sure why.