You know, Michael, I used to sit around looking for a way to make sense of what happened, like there was some kind of answer I could find if I just looked hard enough. Then one day I realized that if there had been one, Dave would still be here. And I wondered if this...this feeling that I couldn't figure it all out...was what Dave had been feeling, too.

The brain of a person in love will show activity in the amygdala, which is associated with gut feelings, and in the nucleus accumbens, an area associated with rewarding stimuli that tends to be active in drug abusers. Or, to recap: the brain of a person in love doesn't look like the brain of someone overcome by deep emotion. It looks like the brain of a person who's been snorting coke.