Falling in love: how does it work? Over the years we gather the odd clue, but nothing adds up. We’d like to think we have a picture of our future partner projected in our mind, all their qualities recorded as if on film, and we just search the planet for that person until we find them, sitting in Casablanca waiting to be recognised. But in reality our love lives are blown around by career and coincidence, not to mention lack of nerve on given occasions, and we never have respectable reasons for anything until we have to make them up afterwards for the benefit of our curious friends.