Love at first sight: is it real?

We often hear about 'love at first sight', but what do we really know about it? How, and more important, why does it happen?

Is it really love or just physical attraction? How could we love someone if we don't know anything about them? Who falls in love at first sight more often, men or women?

Are those people that get married a week after they met mad or is there something scientific going on behind their choice?

Let's try to find these answers by watching a video about what is going on in our brain when we 'fall in love' the first time we meet someone.