...it only lasts one year!!!
IT, would be the very source of love, that has now been found and given the very fetching name "nerve growth factor" or NGF. If ever there was an issue better left alone by scientists I suppose this would be up there on the list.
How can a relationship last longer then? I suppose it is purely a matter of practicality...
Come on my romantic friends, diffuse this terrible science bomb before it is too late: I NEED YOUR HELP!