" Not that this deterred him and his friend Klapaucius from further experimentation, which showed that the extent of a dragon's existence depends mainly on its whim, though also on its degree of satiety, and that the only sure method of negating it is to reduce the probability to zero or lower. All this research, naturally enough, took a great deal of time and energy; meanwhile the dragons that had gotten loose were running rampant, laying waste to a variety of planets and moons. What was worse, they multiplied. Which enabled Klapaucius to publish an excellent article entitled " Covariant Transformation from Dragons to Dragonets, in the Special Case of Passage from States Forbidden by the Laws of Physics to Those Forbidden by the Local Authorities. "