It starts with a look, a passing glance between strangers: one blazing through the cosmos at the speed of light, the other drifting slowly with its head in the clouds. The collision is unexpected but somehow inevitable, a union that promises some of the sweetness that lay beyond the rainbow. The heavier partner is excited beyond measure, active and hopeful. It never occurs to them that their marriage is borne of chance, of probability, of particle calculations drawn up on a chalkboard in a dusty old professor’s office….